. The anatomy of the domestic animals. Veterinary anatomy. 52 THE SKELETON OF THE HORSE and presents a deep central depression and two shallower lateral ones which adapt it to the surface of the cerebellum. The parietal border (Marg;o iiariotalis) is united by suture with the parietal and interparietal. The mastoid border (Margo mastoideus) joins the petro- mastoid part of the temporal l>one. The basilar part is connected by cartilage (in the young subject) with the body of the sphenoid. The conilyles articulate with the atlas. Development.—The occipital bone ossifies in cartilage from four
. The anatomy of the domestic animals. Veterinary anatomy. 52 THE SKELETON OF THE HORSE and presents a deep central depression and two shallower lateral ones which adapt it to the surface of the cerebellum. The parietal border (Marg;o iiariotalis) is united by suture with the parietal and interparietal. The mastoid border (Margo mastoideus) joins the petro- mastoid part of the temporal l>one. The basilar part is connected by cartilage (in the young subject) with the body of the sphenoid. The conilyles articulate with the atlas. Development.—The occipital bone ossifies in cartilage from four centers, and consists at birth of four pieces as described above. The lateral parts unite with the. Fig. 3( A, B, C, .Squamous, lateral, and basilar parts sf occipital bone; D, interp-nrietal bone: E, parietal bone; F, squa- mous temporal bone: G, petro-mastoid part of temporal bone; 1, external occipital protuberance; 2, 2, depresstons iu which complexus tendons are attached; 3, sutural (prcinterparietal?) bone; 4, supraorbital process; 5, zygomatic process of temporal bone; 6, postglenoid process; 7, posterior process of squamous temporal bone; 8, mastoid process; 9, paramastoid process; 10, occipital condj-le; 11, arrow in foramen magnum. basilar part at three to four months, and with the squama in the second year, when the bone is consolidated. The parieto-occipital suture and the spheno-occipital synchondrosis are ob- literated about the fifth year usually. The occipito-mastoid suture partially ossifies in old subjects. The Sphenoid Bone The sphenoid bone (Os sphenoidale) is situated in the base of the cranium, its central part lying in front of the basilar part of the occipital. It consists of the body, two pairs of wings, and two pterygoid processes. The body (Corpus) is situated medially; it is cylindrical, but flattened dorso- ventrally, and wider in front than behind. Its ventral surface (Facies externa) is convex in the transverse direction, and its anterior ]i
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphiladelphialondon
