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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% [6] to 0.5% [7] (1 in 200 to 500) of the population. [8] People may have a cervical rib on the right, left or both sides. [9] [10]
In tetrapods, cervical vertebrae (sg.: vertebra) are the vertebrae of the neck, immediately below the skull. Truncal vertebrae (divided into thoracic and lumbar vertebrae in mammals) lie caudal (toward the tail) of cervical vertebrae. [1] In sauropsid species, the cervical vertebrae bear cervical ribs.
Reconstructed adult and juvenile Spinophorosaurus skeletons (A, B) compared in size with adult and juvenile giraffes (C, D) and a human (E). The holotype specimen was initially estimated to have been around 13 metres (43 ft) in length when measured along the vertebral column, while the paratype was about 13 per cent larger, measuring around 14 m (46 ft).
The dorsal pair of ribs form a rib cage to support the lungs, while the ventral pair disappears. Ichthyostega is another extinct tetrapod. Being one of the first animals with only two pairs of limbs (also unique since they end in digits and have bones), Ichthyostega is seen as an intermediate between a fish and an amphibian.
Ribs connect to vertebrae at the costovertebral joints. [4] The parts of a rib includes the head, neck, body (or shaft), tubercle, and angle. The head of the rib lies next to a vertebra. The ribs connect to the vertebrae with two costovertebral joints, one on the head and one on the neck. The head of the rib has a superior and an inferior ...
A cervical half-ring is a transversally oriented, collar-like row of osteoderms protecting the upper side of the neck in ankylosaurs (the underside of the neck is left bare). An individual usually possessed two cervical half-rings, with the anterior one being smaller than the posterior one. Cervical half-rings are a synapomorphy of Ankylosauria ...
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The following outline is provided as an overview of and topical guide to human anatomy: . Human anatomy is the scientific study of the morphology of the adult human.It is subdivided into gross anatomy and microscopic anatomy.