Cervical vertebra

The cervical vertebrae are the Vertèbre S behind located at the level of the Cou of the Crâne; they belong to the cervical Rachis. They are 7 including 2 particular: the atlas and the axis. They have the general structure of the Vertèbres but with specific characters:

• they are the smallest vertebrae of the Rachis
• the transverse processes are bituberculés and bored foramen transversaire which lets pass the vertebral Artère
• the thorny process is bifide
• the vertebral body present laterally of the hooks or uncus vertical
• the vertebral channel is triangular

Just like the human being, the Mammalian majority of the S, as well the Mouse as the Giraffe, has seven cervical vertebrae. Only the Manatee S, the Paresseux didactyle S and tridactyl make exception. On the other hand, this number is variable but in general higher at the Oiseau X (for example, the Cygne has 24 of them) what enables them to carry out a complete Rotation of the Tête on its axis.

Random links:

Jean Claudio | Idães | Ştefan VI Rareş | Jessica Barker | Route secondary road 901 (High-Vienna) | Abbaye_de_DES_Vignes_de_Jean_de_saint

© 2007-2008 speedlook.com; article text available under the terms of GFDL, from fr.wikipedia.org