. The comparative anatomy of the domesticated animals. Veterinary anatomy. TEE BONES. which forms part of the sphenoid sinus. The posterior border presents, above, a rugged crest called the palatine, flattened from side to side, bent outwards, and bordered at its base and inwards by a very narrow synarthrodia! surface, which responds to the pterygoid bone. It is smooth and concave in its inferior half, and forms, with that of the opposite side, a parabohc arch (palatine arch) which circumscribes, below and at the side, the double guttural orifice of the nasal cavities. Extremities.—The superio
. The comparative anatomy of the domesticated animals. Veterinary anatomy. TEE BONES. which forms part of the sphenoid sinus. The posterior border presents, above, a rugged crest called the palatine, flattened from side to side, bent outwards, and bordered at its base and inwards by a very narrow synarthrodia! surface, which responds to the pterygoid bone. It is smooth and concave in its inferior half, and forms, with that of the opposite side, a parabohc arch (palatine arch) which circumscribes, below and at the side, the double guttural orifice of the nasal cavities. Extremities.—The superior, flattened on both sides, is bevelled on the external side to articulate with the subsphenoidal process. The inferior, flattened from before to behind, is curved inwards and united by simple suture with that of the opposite bone. Structure and deveJopment.—This is a very com- pact bone, developed from a single centre of ossifi- cation. Differential Characteks in the Palatine Bone in OTHER Animals. The principal distinctive feature of this bone in the different domestic animals is due to the part it takes in forming the arch of the palate. In this respect there are very great differ- ences in various species, but in none of them is tliis part so reduced as in Solipeds, in which the bone is scarcely equal to one-fifth of tlie palatine surface. A. Ox, Sheep, G-oat.—Tlie palatine bone in these animals is very developed, and noticeable for the considerable extent of the palatine portion of its external surface. The palatine canal is entirely channeled out in its substauce. The palatine crest, very thin and elevated, is formed altogether by the posterior border of the palate bone, the pterygoid, and the subsphenoidal process. There is no excavation for the sphenoidal sinuses; but, instead, all that part of the bone which enters into the roof of the palate is hollowed, but in the Ox only, by irregular cavities which communicate with the maxillary sinus of the same side. The na
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