176 



THE EAR. 



The inferior ohlique^^ arises from the nasal process of the supe- 

 rior maxillary bone; and passing below the inferior rectus, is in- 

 serted beyond it, into the sclerotica. 



THE EAR. 



The organ of hearing is composed of three parts ; the External 

 Ear, the Middle Ear, or tympanum, and the Internal Ear, or laby- 

 rinth. 



The external ear consists of two parts, the pinna, which is 

 movable upon the side of the head, and the meatus, a tube leading 

 from it. 



The pinna has a number of ridges and hollows upon its surface ; 

 these are : a prominent rim or helix ; and within it another curved 

 prominence, the anthelix, which bifurcates above, so as to enclose a 

 space, called the scaphoid fossa, and describe a deep, capacious, 

 central cup, the concha. At the end of the helix, in front of the 

 concha, is a small detached eminence, the tragus, so named 

 from its bearing a tuft of hair, resembling a goat's beard. Opposite 

 this, behind and below the concha, is the antitragus. Below is the 



Fig. 154. 



pendulous lohe, composed of dense areolar and adipose tissues. The 

 concha is imperfectly divided into an upper and lower part, by the 

 anterior curved extremity of the helix. 



The skin of the pinna is thin, and contains an abundance of seba- 

 ceous follicles. 



