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Forehead
Forehead
Forehead
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Forehead
Male forehead
Details
SystemMultiple
ArterySupraorbital, supratrochlear
VeinSupraorbital, frontal
NerveTrigeminal, facial
Identifiers
Latinsinciput
MeSHD005546
TA98A01.1.00.002
A02.1.00.013
TA2101
FMA63864
Anatomical terminology

In human anatomy, the forehead is an area of the head bounded by three features, two of the skull and one of the scalp. The top of the forehead is marked by the hairline, the edge of the area where hair on the scalp grows. The bottom of the forehead is marked by the supraorbital ridge, the bone feature of the skull above the eyes. The two sides of the forehead are marked by the temporal ridge, a bone feature that links the supraorbital ridge to the coronal suture line and beyond.[1][2] However, the eyebrows do not form part of the forehead.

In Terminologia Anatomica, sinciput is given as the Latin equivalent to "forehead" (etymology of sinciput: from semi- "half" and caput "head".[3]).

Structure

[edit]

The bone of the forehead is the squamous part of the frontal bone.[4][5] The overlying muscles are the occipitofrontalis, procerus, and corrugator supercilii muscles, all of which are controlled by the temporal branch of the facial nerve.[2]

The sensory nerves of the forehead connect to the ophthalmic branch of the trigeminal nerve and to the cervical plexus, and lie within the subcutaneous fat. The motor nerves of the forehead connect to the facial nerve.[2] The ophthalmic branch of the trigeminal nerve, the supraorbital nerve, divides at the orbital rim into two parts in the forehead. One part, the superficial division, runs over the surface of the occipitofrontalis muscle. This provides sensation for the skin of the forehead, and for the front edge of the scalp. The other part, the deep division, runs into the occipitofrontalis muscle and provides frontoparietal sensation.[1]

Blood supply to the forehead is via the left and right superorbital, supertrochealar, and anterior branches of the superficial temporal artery.[2]

Function

[edit]

Expression

[edit]

The muscles of the forehead help to form facial expressions. There are four basic motions, which can occur individually or in combination to form different expressions. The occipitofrontalis muscles can raise the eyebrows, either together or individually, forming expressions of surprise and quizzicality. The corrugator supercilii muscles can pull the eyebrows inwards and down, forming a frown. The procerus muscles can pull down the centre portions of the eyebrows.[6]

Wrinkles

[edit]

The movements of the muscles in the forehead produce characteristic wrinkles in the skin. The occipitofrontalis muscles produce the transverse wrinkles across the width of the forehead, and the corrugator supercilii muscles produce vertical wrinkles between the eyebrows above the nose. The procerus muscles cause the nose to wrinkle.[6]

Society and culture

[edit]

In physiognomy and phrenology, the shape of the forehead was taken to symbolise intellect and intelligence. "Animals, even the most intelligent of them,", wrote Samuel R. Wells in 1942, "can hardly be said to have any forehead at all, and in natural total idiots it is very diminished".[7]

Pseudo-Aristotle, in Physiognomica, stated that the forehead is governed by Mars.[8] A low and little forehead denoted magnanimity, boldness, and confidence; a fleshy and wrinkle-free forehead, litigiousness, vanity, deceit, and contentiousness; a sharp forehead, weakness and fickleness; a wrinkled forehead, great spirit and wit yet poor fortune; a round forehead, virtue and good understanding; a full large forehead, boldness, malice, boundary issues, and high spirit; and a long high forehead, honesty, weakness, simplicity, and poor fortune.[8]

In fighting, slamming one's forehead into one's opponent is termed a headbutt.[9]

See also

[edit]

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Forehead

View on Grokipedia
from Grokipedia
The forehead, also known as the brow or frontal region, is the uppermost portion of , extending from the supraorbital margins (above the eyebrows) superiorly to the frontal hairline and laterally to the temporal lines. It overlies the of the cranium and serves as a key anatomical landmark for facial structure and expression. Anatomically, the forehead consists of multiple layers beginning with the skin, which is thin and highly vascular, followed by subcutaneous fat pads divided into central, middle, and lateral temporal compartments that provide cushioning and allow for mobility. Beneath these lies the , the anterior belly of the , which originates from the galea aponeurotica—a dense fibrous sheet connecting to the —and inserts into the of the eyebrows without direct bony attachments. This muscle, characterized by its vertical, fan-like fibers, is innervated by the (cranial nerve VII) and works in concert with adjacent muscles such as the procerus, corrugator supercilii, and orbicularis oculi to facilitate eyebrow elevation and movement. The underlying adheres closely to the smooth, convex surface of the , contributing to the region's structural integrity. The forehead's functional significance lies primarily in its role in and , as contractions of the frontalis produce characteristic horizontal wrinkles that convey surprise or concern. Clinically, it is a site prone to trauma, infections, and aesthetic concerns due to its prominent and vascular supply from branches of the supraorbital and supratrochlear arteries. In human morphology, variations in forehead shape and height influence facial proportions, with the anterior hairline typically marking the transition to the at the junction of the frontalis and galea aponeurotica.

Anatomy

Bony structure

The constitutes the primary skeletal foundation of the forehead, forming a prominent, curved structure that defines the superior aspect of the anterior cranium. Its squamous portion, the largest and most anterior part, creates the smooth, convex contour of the forehead, extending from the superiorly to the supraorbital margins inferiorly. This portion is thick and diploic in adults, housing the frontal sinuses, paired air-filled cavities that develop within the bone and vary in size but typically occupy the medial two-thirds of the supraorbital region, aiding in lightening the and resonating voice. The supraorbital margin, a sharp ridge formed by the , defines the superior boundary of the and serves as the attachment site for the and . The articulates with several adjacent cranial bones to integrate the forehead into the overall architecture. Posteriorly, it connects to the paired parietal bones via the , a serrated line that marks the boundary between the frontal and parietal regions. Inferiorly, the meets the at the frontonasal suture and the maxillae along the fronto-maxillary suture, while laterally it articulates with the zygomatic bones at the frontozygomatic suture, forming the lateral orbital margins. Medially, it joins the through the sphenofrontal suture, contributing to the orbital roof. These articulations ensure structural stability and protect the anterior and orbital contents. Embryologically, the frontal bone originates from the frontal prominences of the frontonasal process, a midline structure arising from neural crest-derived around the during the fourth week of . These prominences ossify intramembranously, beginning around the eighth week, and fuse across the midline to form a single bone by , though the metopic suture—the persistent remnant of this embryonic division—may remain unfused in some individuals. , the complete persistence of the metopic suture into adulthood, occurs in 1-10% of adults depending on population and represents a benign without functional impairment, though it can influence sinus development or mimic pathology on imaging.

Soft tissues and muscles

The skin covering the forehead is relatively thick, averaging about 1.5 to 2 mm in total thickness, and is characterized by a high density of sebaceous glands that produce sebum to lubricate the surface, along with numerous hair follicles extending continuously to the hairline. Beneath the skin lies the subcutaneous layer, primarily composed of organized into distinct fat compartments, including a central forehead and paired lateral middle forehead compartments. These pads provide cushioning and contribute to the smooth, convex contour of the forehead by filling the space over the underlying structures and allowing for during muscle contractions. The primary muscle of the forehead is the frontalis, the anterior belly of the , which originates from the posterior aspect of the galea aponeurotica—a broad, tendinous sheet spanning the —and inserts into the superficial and of the eyebrows and upper forehead. Its fibers are oriented vertically and obliquely, enabling of the eyebrows and production of horizontal forehead wrinkles through contraction. In the forehead region, the superficial musculoaponeurotic system (SMAS) is represented by a fibrous layer that invests the and blends superiorly with the galea aponeurotica and temporoparietal , forming a continuous network that links the muscle fibers to the and facilitates coordinated movement of the overlying soft tissues. This integration, though less distinct than in the midface, supports the structural integrity of the forehead's soft tissues during dynamic facial motions.

Physiology

Innervation and vascular supply

The sensory innervation of the forehead is primarily provided by the supratrochlear and , which are branches of the ophthalmic division (V1) of the (). The emerges from the to supply sensation to the central and lateral forehead, , and upper , covering the corresponding dermatome that extends superiorly from the orbital rim. Similarly, the exits medially to the trochlea, providing sensory input to the medial forehead and upper , with its dermatome encompassing the paramedian region. These nerves course superficially beneath the , enabling tactile and nociceptive feedback across the forehead's and underlying tissues. Motor innervation to the forehead arises from the temporal and zygomatic branches of the (cranial nerve VII), which supply the of the occipitofrontalis. The temporal branches, emerging from the parotid plexus, travel superiorly across the to innervate the frontalis, facilitating elevation of the eyebrows and . The zygomatic branches contribute secondarily by supporting adjacent orbicularis oculi fibers, though their primary role is periorbital, ensuring coordinated movement in the superior forehead. These branches originate from the motor nucleus in the and exit via the stylomastoid , providing essential for mimetic function. The arterial supply to the forehead derives mainly from the supratrochlear and supraorbital arteries, both terminal branches of the ophthalmic artery, which itself arises from the internal carotid artery. The supraorbital artery passes through the supraorbital foramen, branching to nourish the forehead skin, pericranium, and levator palpebrae superioris muscle, while forming anastomoses with the superficial temporal artery laterally. The supratrochlear artery emerges medially above the trochlea, ascending between the frontalis and corrugator supercilii muscles to supply the medial forehead, glabella, and upper eyelid via cutaneous, muscular, and periosteal branches; it anastomoses richly with the contralateral supratrochlear, supraorbital, and superficial temporal arteries, creating a robust vascular plexus. Venous drainage of the forehead occurs through the supraorbital, supratrochlear, and central veins, which converge into the angular vein at the medial . The angular vein then connects to the , ultimately draining into the , a valveless pathway that facilitates bidirectional flow. This direct communication from the facial veins to the poses a risk for retrograde spread of infections originating in the forehead or midface "danger triangle," potentially leading to . Lymphatic drainage from the forehead follows superficial vessels that collect fluid from the skin and subcutaneous tissues, directing it toward the preauricular and submandibular lymph nodes. The preauricular nodes, located anterior to the ear, receive lymph from the lateral forehead, temporal scalp, and eyelids via efferent channels from facial lymph nodes. Central and medial forehead lymph drains to the submandibular nodes in the submandibular triangle, which also integrate input from adjacent facial regions before forwarding to deep cervical nodes. This network ensures efficient clearance while interconnecting with broader head and neck lymphatic pathways.

Development and variations

The forehead originates embryologically from the frontal region of the frontonasal prominence, which emerges during the fourth week of gestation from -derived adjacent to the and ventral . cells migrate to this prominence, contributing essential mesenchymal components that form the bony and connective tissues of the forehead. The overall facial development, including the integration of the frontonasal prominence with adjacent maxillary and mandibular processes, progresses through proliferation, merging, and fusion of these structures between the fourth and eighth weeks, establishing the basic forehead contour by the end of the embryonic period. Postnatally, the forehead experiences continued growth characterized by downward displacement in subadults followed by forward expansion in adults, driven primarily by bone formation on its anterior surfaces, with occasional localized resorption near the or frontonasal suture. This growth pattern aligns with the broader craniofacial remodeling that accommodates expansion and facial maturation through . A common postnatal alteration is hairline recession associated with androgenetic alopecia, a genetically influenced condition that progressively thins frontal , effectively enlarging the visible forehead area, particularly in genetically predisposed males starting in early adulthood. Natural variations in forehead morphology arise from genetic and ethnic factors, notably in the prominence of the supraorbital ridge, which exhibits with greater forward projection in males due to higher testosterone levels influencing bone development. Across ancestries, supraorbital ridge development differs; for instance, some populations, such as Australian Aboriginal groups, display more robust tori compared to others with smoother profiles. Pathological variations like disrupt normal growth; premature fusion of the metopic suture results in , featuring a narrow, pointed forehead with a midline ridge, while sagittal suture fusion produces , yielding a long, narrow forehead.

Functions

Facial expressions

The , a key component of the epicranial muscle group, plays a central role in forehead-mediated facial expressions by elevating the eyebrows, which produces characteristic horizontal wrinkles across the forehead. This action is particularly prominent in expressions of surprise, where the eyebrows are raised to widen the and signal , or in emphasis, such as during attentive or questioning, enhancing non-verbal communication. The frontalis coordinates with the , often acting as an during expressions involving brow depression, such as frowning, where the orbicularis oculi contributes to lowering the medial and lateral aspects of the eyebrows to convey displeasure or concentration. In states of focused concentration, this coordination results in a furrowed brow appearance, with the frontalis typically relaxing or partially contracting to balance the downward pull, facilitating subtle emotional cues like determination or puzzlement. From an evolutionary perspective, forehead expressions involving brow movements, such as raising mediated by the frontalis, have deep roots in communication, serving to signal like affiliation, submission, or surprise across including great apes and monkeys. These displays likely evolved to enhance social bonding and , with human eyebrow flashes representing a refined version of homologous signals that promote cooperative interactions. Neurologically, forehead expressions are controlled by the dorsal division of the facial motor nucleus in the , which receives bilateral corticobulbar inputs from the and supplementary motor areas, enabling precise, often symmetrical activation of the frontalis and related upper . This organization allows for rapid, volitional modulation of expressions while integrating emotional inputs from limbic structures.

Sensory and protective roles

The skin of the forehead contains a high density of mechanoreceptors, including Merkel cells, Meissner corpuscles, Pacinian corpuscles, and Ruffini endings, which enable acute detection of tactile stimuli such as light touch, , , and stretch. This innervation density is estimated at approximately 48 tactile afferent units per cm² in the forehead region, contributing to its notably high tactile acuity relative to areas like the arm or back. The layered soft tissues of the forehead—comprising , , subcutaneous fat, and underlying muscles—serve a critical protective function by absorbing and distributing forces from frontal impacts, thereby shielding the and the orbital structures including the eyes. Experimental impact tests demonstrate that and forehead soft tissues, including the pericranium and galea aponeurotica, can attenuate a significant portion of linear impact and reduce peak forces on the . Cadaveric studies further indicate that the presence of overlying and forehead soft tissues requires roughly 10 times more force to fracture the underlying compared to bare bone. Forehead skin also supports thermoregulation via its dense population of eccrine sweat glands, averaging around 200 glands per cm², which produce watery sweat for evaporative cooling during heat stress or physical exertion. This mechanism efficiently dissipates excess body heat from the head, a with high metabolic activity and . Additionally, stretch-sensitive mechanoreceptors in the forehead provide proprioceptive feedback during head movements, aiding in the of orientation and contributing to overall postural control; these are primarily supplied by branches of the .

Clinical significance

Disorders and injuries

The forehead is susceptible to various traumas, including contusions, lacerations, and fractures of the . Contusions typically present with localized swelling, bruising, and tenderness due to from blunt force, while lacerations involve breaks that may require assessment for underlying damage. fractures are classified as linear, which are simple cracks without displacement often resulting from low-impact trauma, or depressed, where fragments are pushed inward potentially compressing brain tissue and increasing . These injuries can accompany (TBI), with the (GCS) used to evaluate severity: scores of 13-15 indicate mild TBI, 9-12 moderate, and 3-8 severe, guiding urgent management. Dermatological conditions affecting the forehead often stem from its oily density. Seborrheic dermatitis manifests as erythematous, scaly patches with yellow-white flakes on the forehead, accompanied by itching or burning, particularly in areas of high oil production. vulgaris on the forehead arises from clogged pores due to excess sebum, dead skin cells, and , leading to whiteheads, blackheads, or inflammatory papules that can cause pain and scarring if severe. for both relies on clinical examination, evaluating distribution and characteristics without needing in typical cases. Neurological disorders involving the forehead include frontal sinusitis and from . Frontal sinusitis causes pressure, tenderness, and pain localized to the forehead, often worsening with head position changes, alongside and fever in acute cases. frequently refer throbbing pain to the forehead, unilateral or bilateral, lasting 4-72 hours with associated , , and . These are diagnosed through patient history and clinical criteria, excluding secondary causes via neurological exam. Congenital conditions like positional can distort forehead shape through asymmetric skull flattening, often from prolonged positioning in infants, resulting in a parallelogram-like head with prominent ipsilateral forehead prominence. This non-synostotic deformation is typically beyond cosmetic concerns but may relate briefly to developmental variations in cranial growth. Diagnosis involves clinical measurement of cranial asymmetry, such as . Diagnostic approaches for forehead disorders emphasize imaging and examination tailored to suspected . Computed tomography (CT) scans are the gold standard for detecting fractures, providing detailed views of bone displacement, sinus involvement, and associated intracranial injuries with high sensitivity. For softer issues like dermatological conditions or headaches, clinical exams suffice, including for tenderness or inspection of wrinkles and muscle tension in the frontalis, which may signal tension-type headaches with bilateral forehead pressure.

Surgical and cosmetic procedures

Surgical and cosmetic procedures on the forehead encompass a range of interventions aimed at enhancing aesthetic appearance, correcting functional deficits, or reconstructing trauma-related damage. These procedures target the , underlying bony structures, and soft tissues, drawing on the forehead's anatomical prominence in and contour. Historically, forehead surgery traces its origins to ancient trephination, a technique involving drilling holes in the skull—evident in prehistoric remains dating back over 7,000 years—to treat presumed cranial ailments or release evil spirits, often performed on the . This evolved through the with more systematic cranial approaches, progressing to 19th-century innovations like Riedel's 1898 frontal sinus obliteration for infections, and into the with the advent of coronal incisions for brow elevation in the . Modern methods emphasize minimally invasive endoscopic techniques, introduced in the , which reduce scarring and recovery time compared to open procedures. Cosmetic procedures primarily address dynamic wrinkles and sagging associated with aging. type A (Botox) injections are a first-line, non-surgical option for reducing horizontal forehead lines by targeting the , which elevates the eyebrows and contributes to glabellar frowning. The toxin inhibits release at the , inducing temporary muscle paralysis that smooths wrinkles, with effects lasting 3-6 months and high patient satisfaction in clinical evaluations. Forehead lifts, also known as brow lifts, surgically elevate the brows and smooth forehead for a more youthful appearance. The coronal approach involves an ear-to-ear incision across the , allowing extensive tissue redraping but resulting in longer scars and higher risks of hairline elevation; it remains suitable for severe sagging. In contrast, the endoscopic forehead lift uses small incisions and a camera for precise and fixation, offering shorter recovery (1-2 weeks) and fewer visible scars, with reliable long-term contour maintenance in appropriately selected patients. Reconstructive procedures focus on restoring structural integrity following trauma or pathology. for forehead fractures involves repairing depressed or comminuted defects using autologous bone grafts, plates, or synthetic materials like polymethylmethacrylate to restore aesthetic contour and provide cerebral protection. Outcomes include improved and neurological function, with complication rates of 20-40% reported in various series. For infections, such as chronic or , endoscopic frontal sinusotomy (Draf procedure) is the preferred technique, involving minimally invasive drainage and mucosa preservation to eradicate while maintaining sinus patency. More extensive cases may require cranialization—removal of the posterior sinus wall and obliteration with vascularized flaps—for definitive treatment, yielding infection resolution in over 90% of refractory cases. All forehead procedures carry inherent risks, including nerve damage, scarring, and asymmetry. The frontal branch of the is particularly vulnerable during lifts, potentially causing temporary or permanent brow ptosis or in approximately 0.1% of endoscopic cases. Scarring varies by technique—coronal methods may lead to visible scars, while endoscopic approaches minimize this but risk alopecia at incision sites. Asymmetry and formation can occur, often requiring revision, underscoring the need for precise preoperative planning and surgeon experience.

Cultural and social aspects

Symbolism and historical views

In and , the forehead holds profound spiritual significance as the location of the , commonly known as the "third eye," positioned between the eyebrows. This is regarded as the seat of , , and , enabling perception beyond ordinary vision and facilitating enlightenment. practices often focus on this point to awaken inner wisdom and spiritual awareness, with the third eye symbolizing the transcendence of dualistic thinking toward unity with the divine. Ancient Greek philosophy, particularly through the lens of physiognomy attributed to Aristotle, viewed the forehead as an indicator of intellectual capacity and moral character. A broad or rounded forehead was interpreted as a sign of good understanding, liberality, and virtue, reflecting the belief that facial features mirrored the soul's qualities and mental faculties. This perspective influenced later interpretations of the head's frontal region as the primary locus of reason, distinguishing humans from animals in philosophical discourse. Prehistoric cultures practiced , an ancient surgical technique involving drilling or scraping holes in the , often to release evil spirits believed to cause ailments like headaches, , or mental disturbances residing in the head. Archaeological evidence from sites across and beyond shows that such procedures targeted cranial areas, with survival rates indicating ritualistic or therapeutic intent rather than solely fatal outcomes. The removed fragments were sometimes retained as amulets to ward off malevolent forces, underscoring the forehead and cranium's perceived role as gateways for spiritual intervention. During the , emerged as a pseudoscientific discipline that mapped personality traits and mental abilities to specific skull contours, with the forehead region particularly linked to higher cognitive functions such as intellect, morality, and . Proponents like argued that enlargements or depressions in the frontal lobes, detectable as bumps on the forehead, revealed innate dispositions, influencing fields from to before being discredited by empirical . This practice exemplified a historical fascination with the forehead as a physical emblem of psychological depth. In , high foreheads were a fashionable feature symbolizing elegance and status, often achieved through hair-plucking among elites. Paintings from the period featured figures with prominent foreheads, aligning with the era's ideals of and refinement. This artistic convention reflected humanism's emphasis on grace and sophistication.

Beauty standards and adornment

In Western beauty standards, a smooth and moderately high forehead has historically been prized as a marker of elegance and intelligence, with practices dating back to the and Elizabethan eras where women plucked or shaved their hairlines to achieve this elevated appearance. For instance, during the Victorian period, such alterations were common to emulate the ideal of a broad, unlined forehead symbolizing refinement. In contemporary Western contexts, while a high forehead remains desirable for its association with facial balance, excessively large ones—colloquially termed a "five-head"—are often viewed negatively, prompting individuals to seek camouflaging techniques rather than enhancement. Contrasting this, many East Asian beauty ideals emphasize smaller foreheads as part of an overall petite facial structure, contributing to a youthful and harmonious look. In Korean and Japanese standards, a compact face with proportional features, including a narrower forehead, is favored to align with the "small face" aesthetic that conveys delicacy and attractiveness. This preference influences everything from facial proportions in media to cosmetic adjustments aimed at minimizing perceived forehead height. Adornment practices across cultures have long targeted the forehead to enhance or signify beauty. In Indian tradition, the bindi—a vibrant dot applied to the center of the forehead—serves as both a decorative element and a cultural emblem, typically worn by women to accentuate facial symmetry and denote marital status or auspiciousness. Polynesian societies, particularly among the Māori of New Zealand, incorporate tā moko tattoos on the forehead and face, where intricate patterns denote genealogy, status, and personal achievements, with the head's sacred placement underscoring the wearer's prestige. Historically in Europe, Victorian women extended adornment through hair plucking to artificially enlarge the forehead, aligning with era-specific ideals of sophistication. Modern influences, amplified by media and social platforms, further shape forehead aesthetics through non-invasive methods like hairstyles and makeup. Bangs, such as or side-swept styles, are popular for visually reducing forehead prominence, while techniques with bronzer and create shadows to elongate or shorten the appearance as needed. These trends, disseminated via beauty influencers and advertisements, reflect a broader emphasis on customizable facial harmony over innate features. Gender differences in forehead aesthetics stem from evolutionary pressures, with resulting in females typically exhibiting smoother, higher foreheads due to reduced supraorbital ridge prominence compared to males. This divergence arises from testosterone-driven facial growth during , where males develop more robust brow structures, potentially signaling strength, while female traits align with neotenous features preferred in mate selection for cues of and youth. Such patterns vary across populations but underscore adaptive roles in human attraction.

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