14 HUMAN ANATOMY. 



to the-masseter muscle. It is connected to the body of the bone 

 by three roots, the anterior root of which ends in the eminentia 

 articular is, a process of bone in front of the glenoid cavity, and 

 presents at its junction a tubercle for the external lateral liga- 

 ment; the middle root terminates at the Glaserian fissure, and 

 the posterior root forms the posterior portion of temporal ridge 

 and gives attachment to the retrahens aurem. 



The glenoid fossa is a marked depression hollowed out for 

 articulation of the condyle of the lower jaw. It is bounded in 



23. 



FIG. 7. 



1, temporal fossa; 2, squamous portion; 3, for masseter muscle; 

 4, zygoma; 5, tubercle of zygoma; 6, eminentia articularis; 7, glenoid 

 fossa; 8, Glaserian fissure; 9, petrous portion; 10, meatus auditorius 

 externus; 11, stylo-hyoideus; 12, stylo-glossus; 13, styloid process; 

 14, mastoid portion; 15, sterno-mastoid; 16, retrahens aurem; 17, 

 splenius capitis; 18, trachelo-mastoid; 19, mastoid foramen; 20, 

 auditory process; 21, digastricus; 22, mastoid process; 23, vaginal 

 process. 



front by the eminentia articularis, to the outer side by the 

 middle root, and behind by the vaginal process. It is divided 

 into two portions by the Glaserian fissure, the anterior being 

 separated from the auditory process by the post-glenoid tubercle 

 rudimentary in man and the posterior being formed by the 

 tympanic plate, a thin plate of bone forming the front wall of 

 the tympanum. 



The Glaserian fissure communicates with the tympanum, 

 transmits the tympanic branch of the internal maxillary artery, 

 and lodges the proccssus gracilis of the malleus. 



