FACE 271 



from before backward. As in the ox, a narrow space. separates the right and left 

 bones and takes the place of the foramen incisivum. The palatine process is long 

 and narrow. The nasal process is very extensive and is somewhat rhomboid in 

 outlme Its dorsal border forms a very long suture with the nasal bone, and the 

 ventral articulates to about the same extent with the maxilla. The palatine fissure 

 IS relatively wide. 



The horizontal part of the palatine bone forms a fourth to a fifth of the length of 

 the palate; its palatine surface is triangular, the apex being anterior; its nasal 

 surface IS deeply grooved and smooth. A pterygoid process (Processus pyramidalis 

 of man) projects backward and downward, and its thick rounded end is received 

 between the pterygoid process of the sphenoid and the pterygoid bone. The 

 perpendicular part is largely overlapped laterally by the maxilla and concurs in 



Fig. 180. — Sagittal Section op Skull of Pig, without Mandible. 

 A, A', Basilar and squamous parts of occipital bone; B, body, B' , temporal wing, B'', orbital wing, of sphenoid 

 bone; C, parietal bone; Z>, D' , internal and external plates of frontal bone; B, E', cribriform and perpendicular plates 

 of etiimoid bone; F, pterygoid bone; G, G', perpendicular and iiorizontal parts of palatine bone; B , palatine process of 

 maxilla; /, vomer;' J", nasal bone; K, body of premaxilla; L, dorsal turbinate bone; M, ventral turbinate bone; 

 J, //, III, fossse cranii; 1, hypoglossal foramen; 2, foramen lacerum posterius; 3, meatus acusticus internus; 4, fora- 

 men lacerum anterius; 5, hypophyseal or pituitary fossa; 6, foramen orbito-rotundum; 7, lateral crest between cerebral 

 and cerebellar parts of cranial cavity; 8, optic foramen; 9, ethmoidal foramen; 10, frontal sinus; 11, meatus naso- 

 pharyugeus; 12, 13, 14, dorsal, middle, and ventral nasal meatuses; 15, incisor teeth; 16, canine tooth; 17, premolar 

 teeth: IS, molar teeth; 19, paramastoid process; 20, bulla ossea. 



forming part of the palatine canal. The two plates separate dorsally and inclose 

 an air-cavity which opens into an ethmoidal meatus. The inner plate curves 

 inward and unites with the vomer and ethmoid to form a horizontal plate, the 

 lamina transversalis, which divides the posterior part of the nasal cavity into a 

 dorsal olfactory part and a ventral respiratorj^ part. 



The pterygoid bone is nearly vertical in direction, and is narrow in its middle, 

 wide at each end. The lateral surface is free below and forms the medial wall of 

 the pterygoid fossa. The ventral end is notched and forms a distinct hamulus. 



The nasal bone is very long and its width is almost uniform, except at the 

 anterior end, which is pointed and reaches almost as far forward as the premaxilla. 

 The facial surface is flattened from side to side. In profile it is nearly straight in 

 some subjects, variably concave in others. The lateral border is free to a small 

 extent in front only; otherwise it is firmly connected with the premaxilla and 



