. The anatomy of the domestic animals . Veterinary anatomy. 158 SKELETON OF THE SHEEP to the orbital margin than to the median line. The groove which leads forward from it is often rather faint. The orbital part is deeply concave. The infraorbital canal opens on the medial wall of the orbit as in the ox. The frontal sinus extends backward to a transverse plane through the posterior part of the temporal con- dyle, and forward to one through the anterior margin of the orbit. The temporal bone consists of distinct squamous, tympanic, and petro-mastoid parts. The squamous part in general resembles
. The anatomy of the domestic animals . Veterinary anatomy. 158 SKELETON OF THE SHEEP to the orbital margin than to the median line. The groove which leads forward from it is often rather faint. The orbital part is deeply concave. The infraorbital canal opens on the medial wall of the orbit as in the ox. The frontal sinus extends backward to a transverse plane through the posterior part of the temporal con- dyle, and forward to one through the anterior margin of the orbit. The temporal bone consists of distinct squamous, tympanic, and petro-mastoid parts. The squamous part in general resembles that of the ox, but has, like that of the horse, a notch through which the external acoustic process protrudes. The root of the zygomatic process is perforated by a foramen which opens ventrally behind the postglenoid process, in front of the chief external opening of the temporal canal. The latter extends upward and backward between the petro-mastoid and squamous parts and the parietal bone, and opens into the cranial cavity in front of the apex of the petrous. The tympanic part includes the external acoustic process, the bulla. Fig. 161.—Skull of Sheep; Lateral View. A, Occipital bone; B, parietal bone; C, squamous temporal bone; D, frontal bone; i?, nasal bone; F, lacrimal bone; G, malar bone; Zf, maxilla; I, premaxilla; J, mandible; K, perpendicular part of palatine bone; L, hyoid bone; 1, occipital condyle; 2, paramastoid process; 3, mastoid process; 4, meatus acusticus externus; 5, bulla ossea; 6, zygo- matic process of temporal bone; 7, condyle of mandible; 8, coronoid process; 9, supraorbital process; 10, processus cornus; 11, 11', openings of supraorbital canal; 12, ethmoidal foramen; 13, optic foramen; 14, fossa sacci lacrimalis; 15, bulla lacrimalis;] 16, external lacrimal fossa; 17, facial tuberosity; 18, infraorbital foramen; 19, mental foramen. ossea, and the muscular process; the first resembles that feature in the horse, the others those of the ox, but the ca
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