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The vertebral transverse processes of mammals are homologous to the cervical ribs of other amniotes. [citation needed] Most mammals have seven cervical vertebrae, with the only three known exceptions being the manatee with six, the two-toed sloth with five or six, and the three-toed sloth with nine. [2] [3]
The majority of mammals have seven cervical vertebrae (bones in the neck). The exceptions are the manatee and the two-toed sloth, which have six, and the three-toed sloth which has nine. [84] All mammalian brains possess a neocortex, a brain region unique to mammals. [85]
The transverse processes of mammals are homologous to the cervical ribs of other amniotes. In the whale, the cervical vertebrae are typically fused, an adaptation trading flexibility for stability during swimming. [28] [29] All mammals except manatees and sloths have seven cervical vertebrae, whatever the length of the neck. [30]
The cervical spine, found in all mammals, consists of seven vertebrae which, however, are reduced or fused. This fusion provides stability during swimming at the expense of mobility. The fins are carried by the thoracic vertebrae, ranging from nine to seventeen individual vertebrae.
The alignment of the vertebrae defines the shape of the human neck. [5] As the vertebrae bound the spinal canal, the cervical portion of the spinal cord is also found within the neck. Visceral compartment accommodates the trachea , larynx , pharynx , thyroid , and parathyroid glands .
The occipital condyles are undersurface protuberances of the occipital bone in vertebrates, which function in articulation with the superior facets of the atlas vertebra.. The condyles are oval or reniform (kidney-shaped) in shape, and their anterior extremities, directed forward and medialward, are closer together than their posterior, and encroach on the basilar portion of the bone; the ...
Compared to the narrow vertebrae and the closely positioned zygapophyses of the pleurodires, the cryptodires’ vertebrae take on the opposite shape. Their cervical vertebrae are more distended, and their zygapophyses (processes that interlock adjacent vertebrae) are much more widely spaced—features allowing for a condition called ginglymoidy ...
Anoplotherium has 7 total cervical vertebrae for a series of C1-C7, typical of most mammals. The atlas (C1) is similar to those of camelids such as Lama in form as well as the position of the "alar foramina" in association with facet joint connections involving the axis (C2).