THE CAT 271 



brain case. The optic capsule does not ossify, but the lachrymal 

 is a membrane bone which develops in connection with it. The 

 nasal capsule is formed by the ethmoid, the nasals, and the vomer, 

 the ethmoid bone being a cartilage bone. 



The bones of the visceral skeleton which enter into the forma- 

 tion of the upper jaw and the upper part of the face are the 

 maxillaries, premaxillaries, malars, and palatines. 



The lower jaw, or mandible, is a single bone composed of a 

 right and a left half, joined in the median line. At the proxi- 

 mal end of each half are the condyloid process, which articulates in 

 the glenoid cavity of the temporal bone, and the coronoid process, 

 which projects dorsally and in which the temporal muscle is in- 

 serted. Just in front of the condyle is the inferior dental foramen, 

 through which a branch of the mandibular nerve enters the bone. 



Exercise 61. Draw a view of the medial aspect of the mandible. 



The hyoid apparatus has already been studied (see page 237). 



