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Hub AI
Cervical rib AI simulator
(@Cervical rib_simulator)
Hub AI
Cervical rib AI simulator
(@Cervical rib_simulator)
Cervical rib
Cervical ribs are the ribs of the neck in many tetrapods. In most mammals, including humans, cervical ribs are not normally present as separate structures. They can, however, occur as a pathology. In humans, pathological cervical ribs are usually not of clinical concern, although they can cause a form of thoracic outlet syndrome.
Like other ribs, the cervical ribs form by endochondral ossification.
The cervical ribs of sauropod dinosaurs were extended by ossified tendons, and could reach exceptional lengths; a cervical rib of Mamenchisaurus sinocanadorum was 4.2 metres (14 ft) long.
In birds, the cervical ribs are small and completely fused to the vertebrae.
Cervical ribs are absent in drepanosaurs.
In therian mammals, the cervical ribs fully fuse with the cervical vertebrae to form part of the transverse processes, except in rare pathological cases. In contrast, monotremes retain the plesiomorphic condition of having separate cervical ribs.
A cervical rib in humans is an extra rib which arises from the seventh cervical vertebra. Their presence is a congenital abnormality located above the normal first rib. A cervical rib is estimated to occur in 0.2% to 0.5% (1 in 200 to 500) of the population. People may have a cervical rib on the right, left or both sides.
Most cases of cervical ribs are not clinically relevant and do not have symptoms; cervical ribs are generally discovered incidentally, most often during x-rays and CT scans. However, they vary widely in size and shape, and in rare cases, they may cause problems such as contributing to thoracic outlet syndrome, because they press on the nerves.
Cervical rib
Cervical ribs are the ribs of the neck in many tetrapods. In most mammals, including humans, cervical ribs are not normally present as separate structures. They can, however, occur as a pathology. In humans, pathological cervical ribs are usually not of clinical concern, although they can cause a form of thoracic outlet syndrome.
Like other ribs, the cervical ribs form by endochondral ossification.
The cervical ribs of sauropod dinosaurs were extended by ossified tendons, and could reach exceptional lengths; a cervical rib of Mamenchisaurus sinocanadorum was 4.2 metres (14 ft) long.
In birds, the cervical ribs are small and completely fused to the vertebrae.
Cervical ribs are absent in drepanosaurs.
In therian mammals, the cervical ribs fully fuse with the cervical vertebrae to form part of the transverse processes, except in rare pathological cases. In contrast, monotremes retain the plesiomorphic condition of having separate cervical ribs.
A cervical rib in humans is an extra rib which arises from the seventh cervical vertebra. Their presence is a congenital abnormality located above the normal first rib. A cervical rib is estimated to occur in 0.2% to 0.5% (1 in 200 to 500) of the population. People may have a cervical rib on the right, left or both sides.
Most cases of cervical ribs are not clinically relevant and do not have symptoms; cervical ribs are generally discovered incidentally, most often during x-rays and CT scans. However, they vary widely in size and shape, and in rare cases, they may cause problems such as contributing to thoracic outlet syndrome, because they press on the nerves.