. The anatomy of the domestic animals. Veterinary anatomy. THE ISCHIUM 107 part of the ischiatic spine (Spina ischiadica), which is roughened laterally, smooth medially. Two depressions above and in front of the acetabulum give attachment to the tendons of origin of the rectus femoris muscle. This angle is connected with the wing or wide part of the bone by a constricted part, termed the shaft (Corpus ossis ilium). The latter is of three-sided, prismatic form. Its lateral surface is convex and rough, and gives attachment to the deep gluteus muscle. Its pelvic surface is smooth and is grooved f
. The anatomy of the domestic animals. Veterinary anatomy. THE ISCHIUM 107 part of the ischiatic spine (Spina ischiadica), which is roughened laterally, smooth medially. Two depressions above and in front of the acetabulum give attachment to the tendons of origin of the rectus femoris muscle. This angle is connected with the wing or wide part of the bone by a constricted part, termed the shaft (Corpus ossis ilium). The latter is of three-sided, prismatic form. Its lateral surface is convex and rough, and gives attachment to the deep gluteus muscle. Its pelvic surface is smooth and is grooved for the obturator vessels and nerve. Its ventral surface is crossed l)y vascular grooves, below which there is a rough area, which is bounded medially by the psoas tubercle. Crifti nf ilium. Ischifiiic spine Ischial arch Fig. 86.—Ossa Cox.\rum of Hokse; Dorsal View. A, Wing; A% shaft of ilium; S, acetabular, B\ symphyseal branch of pubis; C, body, C, acetabular branch (or shaft), C"\ symphyseal branch, of ischium: 1, gluteal line; 2, grooves for obturator nerve and vessels; 3, symphysis pelvis; 4, greater sciatic notch; 5, ilio-pectineal eminence; 6* pubic tubercle. Dotted lines indicate primitive separa- tion of three bones. The Ischium The ischium (Os ischii) forms the posterior part of the ventral wall or floor of the bony pelvis. It slopes a little downward and inward, but is practically hori- zontal in the longitudinal direction. The body of the ischium (Corpus ossis ischii) is irregularly quadrilateral, and may be described as having two surfaces, four borders, and four angles. The pelvic surface (Facies pelvina) is smooth and slightly concave from side to side. The ventral surface (Facies ventralis) is nearly flat, and is in great part rough- ened for the attachment i>f the adductor muscles. The anterior border forms the posterior margin of the obturator Please note that these images are extracted from scanned page images that may have been digitally e
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