. L'anatomie de l'animal domestique. Anatomie vétérinaire. L'ostéologie 26 ^drh"^«rild. un plan commun de la structure, qui doit d'abord être compris. Les pièces d'une vertèbre qui se compose sont corps^^, arch,^ et processus. Corps^ (Corpus vertèbres) est le plus ou moins de masse cylindrique sur lequel les autres pièces sont construites. Les extrémités antérieure et postérieure du corps sont attachés à la vertèbre adjacente par fibro-cartilages intervertébraux, et sont généralement convexe et concave, respectivement. La surface dorsale est aplatie et entre dans la formation du canal vertébral,

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. The anatomy of the domestic animals. Veterinary anatomy. 26 OSTEOLOGY ^drh'^'Mrild. a common plan of structure, which must first be understood. The parts of which a vertebra consists are tlie body, tlie arch, and tlie processes. Tlie body (Corpus vertebrae) is the more or less cylindrical mass on which the other parts are constructed. The anterior and posterior extremities of the body are attached to the adjacent vertebrae by intervertebral fibro-cartilages, and are usually convex and concave respectively. The dorsal surface is flattened and enters into the formation of the vertebral canal, while the ventral aspect is rounded later- ally, and is in relation to various muscles and viscera. In the thoracic region the body presents two pairs of facets (Fovese costales) at the extremities for articula- tion with part of the heads of two pairs of ribs. The arch (Arcus vertebrae) is constructed on the dorsal aspect of the body. It consists originally of two lateral halves, each of which is considered to consist of a pedicle and a lamina. The pedicle (Radix arcus vertebra) forms the lateral part of the arch, and is cut into in front antl behind by the vertebral notches (In- cisura verteliralis cranialis, caudalis). The notches of two adjacent vertebrae form intervertebral foramina (Foramina intervertebralia) for the passage of the spinal nerves and vessels; in some vertebrae, how- ever, there are complete foramina instead of notches. The laminae are plates which complete the arch dorsally, uniting with each other medially at the root of the spinous process. The body and the arch form a bony ring which incloses the vertebral foramen (Foramen vertebrale); the series of verte- bral rings, together with the ligaments which unite them, inclose the vertebral canal (Canalis vertebralis), which contains the spinal cord and its coverings and vessels. The articular processes, two anterior and two posterior (Processus articulares craniales, caudales), project from the bor- ders of

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