132 



SKELETON OF THE OX 



amen is situated on each side, at the junction of the occipital and temporal bones; 

 it communicates with the temporal and condyloid canals at their junction. The 

 cerebral surface of the supraoccipital presents a central depression, and above this 

 is a variable but never very pronounced eminence, the internal occipital protuber- 

 ance. A groove on either side leads to the temporal canal. The basilar part is short 

 and wide ; its cerebral surface is deeply concave, and the'internal spheno-occipital crest 

 is prominent. Two large tubercles ventrally mark the junction with the sphenoid. 



Proct'ssut! conius 



A^asal bone 



Angle of mandible 

 Mandible 

 Mental foramen 



Fig. 129. — Skull of Ox; Lateral View. 

 The jaws are separated for the sake of clearness. A, Parietal bone; B, squamous temporal bone; C, occipital bone; 

 D, perpendicular part of palatine bone; E, maxilla; F, malar bone; G, lacrimal bone; H, premardlla; 1, occipital 

 condyle; 2, paramastoid process; 3, meatus acusticus externus: 4, bulla ossea; 5, zygomatic process of temporal bone; 

 6. 6', zygomatic and temporal processes of malar bone; 7, supraorbital process; 8, orbital part of lacrimal bone; 9, 

 lacrimal bulla; 10, fossa sacci lacrimalis; 11, facial tuberosity; 12, infraorbital foramen; 13, condyle of mandible; 14, 

 coronoid process of mandible. 



The foramen lacerum is short and very narrow. In the adult animal the bone is 

 excavated to contain an air-cavity which is regarded as a part of the frontal sinus. 



The sphenoid bone is short. The cerebral surface of the body presents a deep 

 sella turcica, in front of which it rises abruptly. The high anterior part bears a 

 central ridge, the ethmoidal spine, which joins the crista galli of the ethmoid. 

 Two foramina occur on either side. Of these, the large anterior one is equivalent 

 to the foramen rotundum, orbitale, and trochleare of the horse; it may be termed 



