. The anatomy of the domestic animals. Veterinary anatomy. 42 THE SKELETON OF THE HORSE tralia), which are larger than the dorsal series ami diminish in size from first to last; they transmit the ventral divisions of the sacral nerves. The dorsal and ventral foramina communicate wtli the sacral canal and are together equivalent to the usual intervertebral foramina. The lateral borders are rough, thick in front, thin behind. The base (Basis ossis sacri) is directed forward, and is relatively very wide. It i^resents centrally the body of the first sacral segment, which is wide transversely, flat
. The anatomy of the domestic animals. Veterinary anatomy. 42 THE SKELETON OF THE HORSE tralia), which are larger than the dorsal series ami diminish in size from first to last; they transmit the ventral divisions of the sacral nerves. The dorsal and ventral foramina communicate wtli the sacral canal and are together equivalent to the usual intervertebral foramina. The lateral borders are rough, thick in front, thin behind. The base (Basis ossis sacri) is directed forward, and is relatively very wide. It i^resents centrally the body of the first sacral segment, which is wide transversely, flattened dorso-ventrally, and has a rounded surface which articulates with the last lumbar vertelira through the medium of an intcrxcrtebral fibro-cartilage. The ventral margin projects slightly, forming the promontory (Promoutorium). On r. Fig. 19.—Sacrum op Horse; Ventral View. 7-r, Bodies of original five vertebrae, marked off by transverse lines; /-4. ventral sacral foramina; 5, artieular surface of body of first vertebra: 6, 6, notches; 7, 7, surfaces of wings for articulation with transverse processes of laat lumbar vertebra; S, S, wings; 9, auricular surface: W, lateral border; 11, transverse process; 12, posterior orifice of sacral canal; 13, last spinous process. either side of the body there is a smooth notch, which, witli one on the lumbar vertebra, forms a large foramen for the passage of the ventral branch of the last lumbar nerve. Above the body is the entrance to the sacral canal, flanked by a pair of articular processes, which project upward and forward from the arch, antl have concave surfaces medially for articulation with those of the last lumbar vertebra. Lateral to each of these is a smooth notch which is converted into a foramen by apposition with the last lumbar vertebra. The lateral parts of the base, the alae or wings (Ala? sacrales), are strong prismatic masses with pointed ends. Each has in front a large, oval, slightly convex surface for articul
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectveterinaryanatomy
