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Nasal septum
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Nasal septum
The nasal septum (Latin: septum nasi) separates the left and right airways of the nasal cavity, dividing the two nostrils.
It is depressed by the depressor septi nasi muscle.
The fleshy external end of the nasal septum is called the columella or columella nasi, and is made up of cartilage and soft tissue. The nasal septum contains bone and hyaline cartilage. It is normally about 2 mm thick.
The nasal septum is composed of four structures:
The lowest part of the septum is a narrow strip of bone that projects from the maxilla and the palatine bones, and is the length of the septum. This strip of bone is called the maxillary crest; it articulates in front with the septal nasal cartilage, and at the back with the vomer. The maxillary crest is described in the anatomy of the nasal septum as having a maxillary component and a palatine component.
At an early period, the septum of the nose consists of a plate of cartilage, known as the ethmovomerine cartilage.
The posterosuperior part of this cartilage is ossified to form the perpendicular plate of the ethmoid; its anteroinferior portion persists as the septal cartilage, while the vomer is ossified in the membrane covering its posteroinferior part.
Two ossification centers, one on either side of the middle line, appear about the eighth week of fetal development in this part of the membrane, and hence the vomer consists primarily of two lamellae.
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Nasal septum
The nasal septum (Latin: septum nasi) separates the left and right airways of the nasal cavity, dividing the two nostrils.
It is depressed by the depressor septi nasi muscle.
The fleshy external end of the nasal septum is called the columella or columella nasi, and is made up of cartilage and soft tissue. The nasal septum contains bone and hyaline cartilage. It is normally about 2 mm thick.
The nasal septum is composed of four structures:
The lowest part of the septum is a narrow strip of bone that projects from the maxilla and the palatine bones, and is the length of the septum. This strip of bone is called the maxillary crest; it articulates in front with the septal nasal cartilage, and at the back with the vomer. The maxillary crest is described in the anatomy of the nasal septum as having a maxillary component and a palatine component.
At an early period, the septum of the nose consists of a plate of cartilage, known as the ethmovomerine cartilage.
The posterosuperior part of this cartilage is ossified to form the perpendicular plate of the ethmoid; its anteroinferior portion persists as the septal cartilage, while the vomer is ossified in the membrane covering its posteroinferior part.
Two ossification centers, one on either side of the middle line, appear about the eighth week of fetal development in this part of the membrane, and hence the vomer consists primarily of two lamellae.
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