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- 



Squamous part 

 of occipital bone 



Occipital condyle 

 Paramastoid process (tip) 



Basilar part of 

 occipital bone 



Mastoid jyrocess 



Temporal condyle 



Maxillary recess 



., Zygomatic process 



ir of malar bone 



Maxilla 



Molar teeth 



Premolar Irdh 



Canine tooth. 



Prcmaxilla 



Incisor teeth 



Fig. its. — Skull of Pig, Ventral View, without Mandible and Hyoid. 

 1, Hypoglossal foramen; 2, foramen lacerum anteriua; 3, foramen lacerum posterius; 4, bulla ossea; 5, body of 

 sphenoid; G, pterygoid bone, and 6', hamulus of same; 7, vomer; 8, horizontal, and 8', perpencUcular, 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, choanffi 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 bj' the supraorbital foramen and the groove leading forward from the 

 foramen to the nasal bone. The supraorbital canal opens into the orbit at the 



