HEAD. 73 



Turbinated Bones. — Tlie anterior, superior or 

 ethmoidal, and posterior or maxillarv. The internal 

 surface is divided by transverse plates ; between 

 these and the surrounding bones are found the 

 three meatuses. Development : one nucleus for 

 each. 



YoMER. — Has two faces, smooth, an anterior border 

 grooved, and a posterior sharp superiorly, thick and ar- 

 ticular inferiorly ; an anterior extremity going to the 

 incisive slit, and a posterior notched and articular. 

 Development: one nucleus of ossification. 



Inferior Maxillary. — Division : Two faces, two boi'- 

 ders and two extremities. External face half smooth and 

 half rough, shows below the mental foramen ; internal 

 face shows the maxillo-dental canal, the myloid ridge 

 and the glenoid surface. The anterior border is 

 alveolar and divided into two parts; the posterior 

 border has also two parts, and offers tlie maxillary 

 fissure and maxillary tuberosity. The superior extrem- 

 ity has a condyle, coronoid process and corono-condy- 

 loid notch ; the inferior forms the body, with an anter- 

 ior face, buccal, and a posterior, labial. Its circumfer- 

 ence has the alveoli for the incisive teeth. The neck 

 of the bone is at the iunction of the two branches. 

 Development : two nuclei of ossification. 



