CHAP. III.] SKELETON OF THE HEAD AND TRUNK. T") 



§ 34. The LACHRYMALS arc also very small bones, one of which 

 is placed at the anterior part of the inner wall of each orbit (Fig. 46, 

 hi), having the frontal above, the os planum behind, the nasal pro- 



B 



C 



Fig. 41. — Eight Xasal. 



A. E.xternal surface. 



B. Surface turned towards tlie other nasal. 



C. Outer lateral surface. 

 a. External angle. 



71. Fossa for nasal process of maxilla. 



.o 



Right LACHEYMAii. 



Fig. 42 



A. Outer surface. 



B. Innei- surface. 



cess of the maxilla in front, and the orbital plate of the same bone 

 below. Each lachrymal is marked by a vertical groove and notch (n), 

 which, by joining the similarly directed groove on the posterior side 

 of the nasal process of the maxilla, forms a foramen and canal, 

 called " lachrymal," which leads from the orbit to the nasal cavity. 

 § 35. The PALATINES are two bones which by their median 

 junction behind the maxilla?, complete the bony palate, which, as 

 we have already seen, is partly formed by the palatine plates of the 



B 



Fig. 43.— Right Pal.\tine Bone. 



A. Ventral aspect. 



B. Cranial, or dorsal aspect. 



C. Anterior aspect. 

 o. Ascending plate. 



7i. Horizontal plate. 

 3. Palatine foramen. 

 5. The spheno-palatiue foramen. 



maxilla?. The palatine is irregular in shape, consisting mainly of 

 two unequal plates, which are inclined inwards towards each other 

 at an acute angle — one ascending, one horizontal. The bone is 

 wedged in between the maxilla in front and the pterygoid behind. 

 It bounds the meso-pterygoid fossa laterally, and the hinder part of 

 the nasal ca\aty inferiorly ; and it forms part of the floor and of the 

 inner wall of the orbit. 



The ascending j^^afc (a), which is the main portion of the bone, is 



