THE SKELETON. 



55 



ferior dental foramen, which transmits the inferior dental 

 nerve and artery traversing the dental canal extending 

 within the bone to the mental foramen on the lateral sur- 

 face near the base of the canine tooth. The space on the 

 dorsal border between the canine 

 and the first premolar tooth is 

 called the diastema. 



The ascending ramus or por- 

 tion of the bone caudad of the 

 inferior tooth is marked by six 

 features: (i) the fossa on the 

 outer or lateral surface which 

 gives insertion to the masseter 

 muscle ; (2) the angle which is the 

 caudoventral termination of the 

 'bone; (3) the inferior notch im- 

 mediately dorsal of the angle ; (4) 

 the condyle for the articulation 

 with the glenoid cavity of the 

 temporal; (5) the superior notch 

 dorsal of the condyle; (6) the 

 coronoid process, which is the 

 dorsal termination of the ascend- 

 ing ramus and gives insertion to 

 the temporal muscle. 



FIG. 20. CENTRAL ASPECT 

 OF LARYNX, HYOID BONES, 

 AND TONGUE. The tongue 

 has been cut transversely 

 near its middle and its mus- 

 cles fixing it to the hyoid 

 have been removed. 



bh, Basihyal; ch, ceratohyal; 

 cr, cricoid cartilage of the 

 larynx; eh, epihyal; ep, 

 epiglottis; /g, cricothyroid 

 ligament; lyk, thyrohyal; 

 rg, rings of cartilage in the 

 trachea; tc, thyroid cartil- 

 age of the larynx ; tm, tym- 

 panohyal; sh, stylohyal. 



THE HYOID BONES OR HYOID 

 APPARATUS. 



The hyoid bones consist of two 

 jointed rods, one on either side 



(Figs. 20 and 21), hanging from the temporal bone, and 

 supporting the larynx. Each rod is composed of six 

 parts : the epihyal ; the ceratohyal ; the tympanohyal ; the 



