72 



THE CAT. 



[CHAP. III. 



Close to the upper margin of the anterior lateral aspect of the 

 lateral ethmoid is a small smooth, nearly triangular, surface, which 

 appears on the inner wall of the orbit between the lachrymal, the 

 frontal, and the palatine. It is called the os jylanum ; the lamellae 

 which spring from the cribriform plate are also connected with the 

 OS planum. 



§ 29. The anterior inferior portion of the ethmoid mass (Figs. 49 

 and 50, 7nt) is really a separate bone, called jniaxillo-turbinal. This 

 consists of other plicated delicate lamellae which proceed from the 

 inner surface of the maxilla. The grooves and folds of this mass 

 of lamellae all proceed upwards and forwards. 



.The passage between this maxillo-turbinal and the upper surface 



3S.— Thk Right Maxilla. 



A. External aspect. 



B. Internal aspect. 

 m. Atalar process. 

 n. Nasal process. 



o. Siitnral ridge. 



/. Tuberosity. 



2. lufra-orbital foramen. 



of the roof of the mouth is called the inferior meatus of the nose. 

 The passage between this and the maxillo-turbinal, and the ethmo- 

 turbinal, is called the middle meatus of the nose. 



A passage which traverses the ethmo-turbinal on a line with the 

 inferior margin of the nasal bones is called the siqycrior meatus of 

 the nose. 



The mass of the ethmoid lies between the nasals and frontals 

 above ; the orbital plate on the frontal, the presphenoid, the 

 palatine, and the lachrymal on each side, and by the presphenoid, 

 the vomer, and the palatines below. 



THE BONES OF THE FACE. 



I 30. na\ang described those bones which enter into the com- 

 position of the brain-case, it remains to describe those of the face, 

 namely, the maxillary and prc-maxillary bones, the nasals, the 

 malars, the lachrymals, the palatines, the vomer, the mandible, and 

 the hyoid bone. The turbinal bones or maxillo-turbinals have 

 already been noticed in describing the ethmoid, of which they seem 

 to form the anterior, inferior portion. 



