. The anatomy of the domestic animals . Veterinary anatomy. 42 THE SKELETON OF THE HORSE tralia), which are larger than the dorsal series and diminish in size from first to last; they transmit the ventral divisions of the sacral nerves. The dorsal and ventral foramina communicate with 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 presents 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 and diminish in size from first to last; they transmit the ventral divisions of the sacral nerves. The dorsal and ventral foramina communicate with 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 presents 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 vertebra through the medium of an intervertebral fibro-cartilage. The ventral margin proj ects slightly, forming the promontory (Promontorium). On. Fig. 19.—Sacru-M of Horse; Ventral View. /-T', Bodies of original five vertebrte, marked off by transverse lines; i-4. ventral sacral foramina; 5, articular surface of body of first vertebra; 6, 6, notches; 7, 7, surfaces of wings for articulation witii transverse processes of last lumbar vertebra; 8, 8, wings; 9, auricular surface; lOt 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, with one on the last 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, and 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 (Alae sacrales), are strong prismatic masses Avith pointed ends. Each has in front a large, oval, slightly convex surface for articula
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