. The anatomy of the domestic animals . Veterinary anatomy. no THE SKELETON OF THE HORSE bones are not fused until the second year. The epiphyseal parts fuse with the main mass at four and a half to five years of age. The acetabular part of the pubis ossifies from a separate center. It is most distinct in the embryo at three months, and is often called the os acetabuli. Martin says that the ihum has a center for the acetabular part, one for the shaft and wing, and a third for the crest. He also states that there is a special center for the acetabular part of the ischium, and a transitory nucle
. The anatomy of the domestic animals . Veterinary anatomy. no THE SKELETON OF THE HORSE bones are not fused until the second year. The epiphyseal parts fuse with the main mass at four and a half to five years of age. The acetabular part of the pubis ossifies from a separate center. It is most distinct in the embryo at three months, and is often called the os acetabuli. Martin says that the ihum has a center for the acetabular part, one for the shaft and wing, and a third for the crest. He also states that there is a special center for the acetabular part of the ischium, and a transitory nucleus in the symphyseal part of the pubis. THE PELVIS The bony pelvis is composed of the ossa coxarum, the sacrum, and the first three coccygeal vertebrae. The dorsal wall or roof is formed by the sacrum and first three coccygeal vertebra, and the ventral wall or floor by the pubic and ischial Crest of ilium Sacral Tuber spines sacrale Tuber coxce. Nutrient foramen Psoas tubercle Depression in which tendon of rectus femoris is attached Ilio-pectineal e^yiinence -Acetabulum Tuber ischii Pubic tubercle Ischium Fig. 88.—Pelvic Bones of Mare, Viewed from in Front and Somewh.^t from Below. 1, Body of first sacral segment; 2, surface on wing of sacrum for articulation with like surface on transverse process of last lumbar vertebra; 3, wing of sacrum; 4, sacro-iliac articulation; 5, sacral canal; 6, promontory; 7, apex of sac- rum; S, ilio-pectineal line; 9, ischiatic spine; 10, grooves for ilio-lumbar vessels; 11, grooves for iliaco-femoral vessels. bones. The lateral walls are formed by the ilia and the acetabular part of the ischia. The defect in the skeleton here is supplied in the fresh state by the sacro- sciatic ligaments and semimembranosus muscles. The anterior aperture or inlet of the pelvis (Apertura pelvis cranialis) is bounded by the terminal line (Linea terminalis) or brim, which is composed of the base of the sacrum dorsally, the ilio-pectineal lines laterally, and the p
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