22 HUMAN ANATOMY. 



It has no muscular attachments. 



Its ossific centres are three one for the lamella and one for 

 each lateral mass. 



BONES OF THE FACE. 



The bones of the face are fourteen in number six pairs and 

 two single bones: Two lachrymal, two nasal, two malar, two 

 superior maxillary, two palate, two turbinal, one vomer, and one 

 inferior maxillary. 



THE LACHRYMAL are two small, thin bones forming part 

 of the inner wall of the orbit and the lachrymo-nasal duct, and 

 named, from their resemblance to a finger-nail, the ossa unguis. 



Each presents externally: 



The lachrymal crest affords attachment for the tensor tarsi 

 and separates the anterior surface from the groove; 



The groove forms part of the lachrymal groove and lodges 

 the lachrymal sac; 



The hamular process, or, when separate, called the lesser 

 lachrymal bone, projects downward and articulates with the 

 lachrymal tubercle of the superior maxilla. 



Internally : 



A furrow, corresponding to the lachrymal crest on the ex- 

 ternal surface; 



The internal surface enters into the formation of the middle 

 meatus, closing in the anterior ethmoidal cells. 



It articulates with .four bones the frontal, ethmoid, supe- 

 rior maxilla, and inferior turbinated. 



The only muscular attachment is the tensor tarsi. 



It is developed from one ossific centre. 



THE NASAL bones are two irregularly quadrate bones form- 

 ing together the bridge of the nose. 



The outer surface, covered by the compressor nasi and py- 

 ramidalis muscles, presents 



A foramen, transmitting a small vein. 



The inner surface presents 



A groove or canal for a branch of the nasal nerve. 



The inferior border, the most important, has attached to it 

 the lateral cartilage of the nose, and presents 



A spine, forming, with its fellow, the nasal angle, a notch 

 for exit of the branch of the nasal nerve which grooves the pos- 

 terior surface. 



It articulates with four bones frontal, ethmoid, superior 

 maxilla, and its fellow. 



It has no muscular attachments. It is developed from one 

 centre. 



