168 SKELETON OF THE PIG 
bone. The lateral part (Planum temporale) faces outward and is more extensive; 
it is concave, forms a large part of the temporal fossa, and is overlapped ventrally 
by the squamous temporal. The parietal crest extends in a curve from the nuchal 
crest forward and outward to the supraorbital process. The cerebral surface is con- 
cave and is marked by digital impressions. The ventral border projects into the 
cranial cavity and forms a crest which separates the cerebral and cerebellar compart- 
Foramen Squamous part 
magnum of occipital bone 
Occipital condyle —_£ e 
Basilar part of 
occipital bone 
Mastoid process 
Temporal condyle 
Mavillary recess 
Zygomatic process 
of malar bone 
Macilla 
Molar teeth 
Premolar teeth 
Premazilla 
Fic. 178.—Sku.u or Pic, VENTRAL VIEW, WITHOUT MANDIBLE AND Hyor. 
1, Hypoglossal foramen; 2, foramen lacerum anterius; 3, foramen lacerum posterius; 4, bulla ossea; 5, body of 
sphenoid; 6, pterygoid bone, and 6’, hamulus of same; 7, vomer; 8, horizontal, and 8’, perpendicular, part of palatine 
bone; 9, pterygoid process of palatine bone; 10, pterygoid process of sphenoid bone; 11, supraorbital process; 12, or- 
bital opening of supraorbital canal; 13, choane or posterior nares; 14, 14’, anterior palatine foramen and groove; 15, 
palatine fissure. 
ments laterally. The interior is excavated and forms part of the frontal sinus in 
the adult. There is no temporal canal. 
The frontal bone is long. The frontal surface slopes downward and forward, 
the inclination varying in different subjects. The anterior part is concave and is 
marked by the supraorbital foramen and the groove leading forward from the 
foramen to the nasal bone. The supraorbital canal opens into the orbit at the 
