. The comparative anatomy of the domesticated animals. Veterinary anatomy. 50 THE BONES. Differential Characters of the Parietal Bone in other Animals. A. Ox.—The parietal bone in the Ox does not occupy the anterior aspect of the head, but concurs with the occipital to form the base of the neck. It represents a very narrow osseous plate, elongated transversely, and curved at its two extremities, which descends into the temporal fossae to rest upon the sphenoid bone. There are no parietal ridges. The internal protuberance is only marked by a slight elevation of the internal plate; for the most
. The comparative anatomy of the domesticated animals. Veterinary anatomy. 50 THE BONES. Differential Characters of the Parietal Bone in other Animals. A. Ox.—The parietal bone in the Ox does not occupy the anterior aspect of the head, but concurs with the occipital to form the base of the neck. It represents a very narrow osseous plate, elongated transversely, and curved at its two extremities, which descends into the temporal fossae to rest upon the sphenoid bone. There are no parietal ridges. The internal protuberance is only marked by a slight elevation of the internal plate; for the most part it belongs to the occipital bone. The parietal bone of the Ox is developed from three centres of ossification, and the middle nucleus is even primarily divided into lateral halves; but these centres «re consolidated with each other at an early period, as well as with the anterior portion of the occipital. It does not aid in the formation of the parieto-teniporal canal, and is excavated internally by cavities which communicate with the frontal sinuses. B. Sheep, Goat.—The parietal bone of the Sheep and Goat is relatively much larger than that of the Ox. It participates in the formation of the parieto-temporal canal, and has no sinuses. C. Camel.—This bone occupies the anterior face of the cranium; but it is long, narrow, and deeply lodged between the squamous portion of the temporal bone and the frontal bone, to rest on the sphenoid. The parietal crests, thin and elevated, lie against each other for nearly their entire lengtli, and are not pro- longed to the frontal bone (Fig. 45). These crests do not exist at an early age. D. Pig.—The parietal bone is very thick; it has two very marked crests, which do not meet at their upper part (Fig. 28). E. Dog, Cat.—In the Dog, the parietal bone is distinguished by the great development of the temporal crests (Fig. 2li). In the Cat there are scarcely any parietal crests, and the in- ternal protuberance is replaced by two gr
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