CRANIUM 169 
upper part of the medial wall of the latter. The supraorbital process is short and 
blunt-pointed, and is not connected with the zygomatic arch. The gap in the or- 
bital margin is closed by the orbital ligament in the fresh state. The orbital part 
is extensive and forms the greater part of the medial wall of the orbit. Its upper 
part is perforated by the orbital orifice of the supraorbital canal, in front of which 
is the distinct fovea trochlearis. The ethmoidal foramen is situated in the ventral 
part near the junction with the orbital wing of the sphenoid. The temporal part 
is very narrow and is separated from the orbital plate by a ridge which joins the 
Parietal bone 
Nuchal crest 
Temporal fossa 
Temporal crest 
Squamous temporal! 
bone Parietal crest 
External acoustic 
meatus 
Zygomatic process 
of temporal bone 
Supraorbital pro- 
cess 
Frontal bone 
Supraorbital fora- 
men 
Zygomatic process 
of malar bone 
Lacrimal bone 
Lacrimal foramen 
Preorbital fossa 
Mazilla 
Infraorbital foramen 
Nasal process of premaxilla 
Nasal bone 
Canine tooth 
Palatine fissure 
Body of premazilla 
Fie. 179.—Srvtt or Pia; Dorsat View. 
pterygoid crest below. The interior of the bone is excavated by the frontal sinus in 
practically its entire extent in the adult. In the young subject the cavity is con- 
fined to the anterior part and the rest of the bone is thick. 
The temporal bone has a general resemblance to that of the ox. The zygo- 
matic process is short and stout and is bent at a right angle. The dorsal border of 
the process is thin; traced from before backward it curves sharply upward and 
forms a high prominence in front of the external acoustic meatus; beyond this 
it drops rather abruptly and is then continued upward to the nuchal crest. The 
anterior part of the ventral border joins the zygomatic process of the malar, which 
