52 



BONES OF THE HEAD. 



extremity of the spheno-maxillary fissure. The facial surface is conrex, 

 and pierced by one or more malar foramina, which pass through from 



Fig. 43. — Right jMalar Bone. (A. T.) | 



A, from the outside ; B, from tlie inside. 

 1, siTperior or frontal angle and seiTated edge ; 2, 

 posterior or external angle and serrated surface for the 

 zygoma ; 3, anterior or internal angle ; 4, inferior 

 angle ; from 1 to 2, the temporal border ; from 1 to 3, 

 the orbital border ; from 1 to 8, edge of articulation 

 with the frontal and sphenoid bones ; at 8, the notch 

 sually terminating the spheno-maxillary fissure ; 

 from 2 to 4, the masseteric rough border ; between 

 8, 3, and 4, the triangular serrated surface for articula- 

 tion with the superior maxillary bone ; 5, the external 

 surface ; 6, the deep or posterior surface ; 5 and 6, are 

 placed near the foramina for the temporo-malar nerves ; 

 7, the orbital surface, with the orbito-malar foramen. 



the orbital surface and transmit a small nerve 

 and vessels. The orbital surface is concave 

 from above downwards, and enters into the 

 formation of the outer wall and floor of the 

 orbit. The posterior surface is concave from 



side to side, and looks into the temporal and zygomatic fossae ; it is 



also pierced by a small foramen. 



THE NASAL BONE. 



The nasal bones form the bridge of the nose. They are thick and 

 narrow above, but gradually become wider and thinner below. The 

 su[)erior border of each is serrated, and articulates with the frontal 

 bone ; the inferior supports the lateral nasal cartilage ; the external 

 edge articulates with the ascending process of the superior maxillary 

 bone; and the internal with its fellow, with the nasal spine of the 



Fi-. 44. 



Fig. 44. — PiiGHT Nasal Bone. (A. T.) | 



A, from the front ; B, from behind. 



1, upjjer or frontal serrated border ; 2, internal border 

 for adjacent articulation ; 3, external or superior maxillary 

 border ; 4, lower free border ; in B, 4 is placed at the 

 lower end of the groove for the nasal nerve. 



frontal bone, and frequently with the perpen- 

 dicular plate of the ethmoid. Tlie anterior 

 surface, concave at its upper part, convex iu 

 the rest of its extent, presents a minute vascular 



; the posterior or nasal surface is marked by a groove for the 



of the nasal nerve. 



THE LACHEYMAIi BONE. 



The lachrymal bone, or os unguis, is a thin scale of bone placed at 

 the anterior and inner pai-t of the orbit. It articulates superiorly with 

 the frontal bone, posteriorly with the orbital plate of the ethmoid; 

 anteriorly it presents a longitudinal or vertical groove, and articulates 

 with the ascending process of the superior maxillary bone, completing 



foramen 

 passage 



