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, 
Processus cornus 
Frontal bone 
| 
Nasal bone 
Angle of mandible 
Mandible 
Mental foramen 
Fig. 129.—SkKULL 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, prema=xilla; 1, occipital 
condyle; 2, paramastoid process; 3, meatus acusticus externus; 4, bulla ossea; 5, zygomatic process of temporal bone; 
es of malar bone; 7, supraorbital process; 8, orbital part of lacrimal bone; 9, 
3; 11, facial tuberosity; 12, infraorbital foramen; 13, condyle of mandible; 14, 
6, 6’, zygomatic and temporal proce: 
lacrimal bulla; 10, fossa sacci lacrim¢ 
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 tureica, 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 
