140 



SKELETON OF THE PIG 



into the cranial cavity. The foramen magnum is almost triangular, and is 

 narrow above, where it is flanked by two small tuberosities. The paramastoid 

 processes are extremely long and project almost straight downward. The hypo- 

 glossal foramen is at the inner side of the root of the process. The basilar 

 part is short and wide; its lower surface bears a thin median ridge and two 

 lateral imprints or tubercles which converge at the junction with the sphenoid 

 bone. 



Parietal bone 

 Temporal fossa 



Squamous tem-poral 

 hone 

 External auditory 

 meatus 



Zygomatic process 

 of temporal hone 

 Supraorhital pro- 

 cess 

 Frontal hone 



Supraorbital fora- 

 men 

 Zygomatic process 

 of malar bone 

 Lacrimal bone 



Infraorbital foramen 



Nasal process of premaxiUa 



Nasal hone 



Canine tooth 



Palatine cleft 

 Body of premaxiUa 



Occipital crest 

 Temporal crest 

 Parietal crest 



Lacrimal foramen 

 - Preorbital fossa 



Fio. 110. — Skui.i. or I'l.., Dorsal View. 



The interparietal fuses before birth with the occipital. The tentorium osseum 

 is absent. 



The parietal is overlapped ])y the occipital bone behind and concurs in the 

 formation of the occipital crest. Its external surface is divided by the parietal 

 crest into two parts. The inner part (Planum parietale) faces upward and forward, 

 and is flattened and smooth. Its inner border is short and straight and unites early 

 with the opposite bone. Its anterior border is concave and joins the frontal bone. 

 The outer part (Planum temporale) faces outward and is more extensive; it is 

 concave, forms a large part of the temporal fossa, and is overlapped below by the 

 squamous temporal. The parietal crest extends in a curve from the occipital crest 



