510 



MAMMALIAN ANATOMY 



Fro. 410. 



HUMAN SKULL. 

 FRONT ASPECT. 



If the skull of man and the skull of the cat be placed side by side, 

 with the anterior ends directly in front of the student, the following 



general differences between them 

 can be readily observed : 



In man's skull, the anterior 

 outline is vertically oval ; the 

 forehead is high, broad, and 

 almost vertical ; the face below 

 and between the orbits is flat, 

 and the lower part of the median 

 symphysis of the lower jaw pro- 

 jects anterior to the teeth. 



In the cat's skull, the outline 

 is transversely oval ; the forehead 

 is narrow and slopes rapidly back- 

 ward ; the face anterior to the 

 orbits is prolonged forward, and 

 the chin retreats so far that its 

 mental point is under a line 



THE SKULL, SEEN PARTLY IN FRONT AND ON 

 THE RIGHT SIDE. 



1, frontal bone; 2, parietal bone; 3, temporal bone, 

 squanious portion; 4, sphenoid bone, temporal sur- 

 face of its great wing; 5, ethmoid bone, orbital sur- 

 face; 6, maxilla; 7, malar bone; 8, lachrymal bone; 9, 

 nasal bone; 10, mandible; o, orbital plate of the frontal joining the Small fil'St UDDCr pl'6- 

 bone; 6, temporal surface; c, orbital surface of the 



large wing of the sphenoid bone; d, rnastoid portion molar teeth, 

 of the temporal bone; e, orbital surface of the malar 



bone ;/, orbital plate of the maxillary ; gr, infraorbital J n man, the alveolar parts of 



foramen ; h, mental foramen ; i, symphysis ; j, rarnus ; 



k, coronoid process; I, condyloid process; m, angle; tll6 maxillary boilCS form a CUl'VCd 

 n, lachrymal fossa. 



process which projects downward 



far below the level of the malar bones and is separated from them by 

 conspicuous notches. 



In the cat, the alveolar border is V-shaped, does not project down- 

 ward, and is near the lower margins of the nasal and orbital openings. 



In man, the nasal bones project prominently forward above the 

 nasal aperture, which is narrow above and wide below. 



In the cat, the nasal bones are flattened and the nasal aperture is 

 wide above and narrow below. 



In man, the orbits are relatively small and close together ; each 

 orbit is shut off from the temporal fossa by a bony wall, formed by 

 processes from the frontal, sphenoid, and malar bones. 



In the cat, the orbits are large, more widely separated, and face 



