360 



HUMAN ANATOMY. 



Concha, a deep cavity, surrounded by the helix, and leading 

 into the external meatus. 



Muscles. The muscles of the auricle include two sets, the 

 extrinsic muscles, already described (vide Muscles), of which 

 there are three the attolens aurem, attrahens aurem, and re- 

 trahens aurem and the intrinsic muscles, but slightly devel- 

 oped, of which there are two sets, four on the anterior surface 

 of the auricle the tragicus, antitragicus, helicis major, and 



FIG. 163. 



External, middle, and internal ear. 1, external ear; 2, middle ear; 

 3, internal ear; 4, pinna; 5, helix; 6, antihelix; 7, fossa navicularis; 

 8, fossa innominata; 9, tragus; 10, antitragus; 11, concha; 12, lobe; 

 13, meatus auditorius externus; 14, tympanic membrane; 15, promon- 

 tory; 16, foramen rotundum; 17, posterior wall of the tympanum; 18, 

 ossicula auditus; 19, Eustachian tube; 20, narrow canal; 21, vestibule; 

 22, semicircular canals, the superior, posterior, and horizontal; 23, 

 ampullae; 24, cochlea; 25, prominence caused by the scala vestibuli, 

 26, scala tympani. (Boenning.) 



helicis minor and two on the posterior surface, transversus 

 auriculae and obliquus auriculae. 



Arteries, auricular branch, from the occipital; posterior 

 auricular, from the external carotid; and anterior auricular, 

 from the temporal. The veins correspond to the arteries. 



Nerves, auricular branch, from the pneumogastric ; auriculo- 

 temporal branch, from the inferior maxillary; occipitalis major 



