A manual of otology for students and practitioners . e auditory apparatuswhich is situated external to the membrana tympani, andconsists of the auricle and auditory canal or meatus. Auricle.—The auricle or pinna is an irregular, oval-shaped appendage, composed of a cartilaginous frame-work covered with integument. It is attached to theside of the head at an angle so that its posterior surfaceis directed internally, and its anterior surface is directedexternally. Its posterior surface is comparatively smooth,while its anterior surface is irregular and more or lessconcave, thus acting to collect
A manual of otology for students and practitioners . e auditory apparatuswhich is situated external to the membrana tympani, andconsists of the auricle and auditory canal or meatus. Auricle.—The auricle or pinna is an irregular, oval-shaped appendage, composed of a cartilaginous frame-work covered with integument. It is attached to theside of the head at an angle so that its posterior surfaceis directed internally, and its anterior surface is directedexternally. Its posterior surface is comparatively smooth,while its anterior surface is irregular and more or lessconcave, thus acting to collect sound waves and conduct2 18 ANATOMY AND PHYSIOLOGY OF THE EAR them into the external auditory canal. It presents numer-ous eminences and depressions. These vary in differentsubjects, both in size and position, but it is usually notdifficult to identify t,hose shown in the cut (Fig. 1), astudy of which conveys a very good impression of thename and location of these eminences and depressions. DARWINIANTUBERCLE rOSSA TRIANGULAniS CRURA or ANTIHELIX. cRus or HELIX INCISURAANTERIOR TUBERCULUMSUPRATRAGICUM EXTERNALAUDITORYMEATUS INCISURAINTERTRACICA POSTERIOR AURICULAR SULCUS CAVUM CONCHAE Fig. 1.—Anterior and external view of the auricle. (Gray.) The muscles of the ear are rudimentary in man and notof surgical importance. The auricle is attached to thetemporal bone by three ligaments—the superior, anteriorand posterior—w^hich extend from the cartilaginous frame-work of this structure to the bone forming the entranceto the external auditory canal. The blood supply of the auricle is received through the EXTERNAL EAR * 19 posterior auricular from the external carotid, the anteriorauricular and some smaller branches from the temporal. The nerves are the auricularis magnus from the cervicalplexus, the auriculotemporal, T\hich is a branch of theinferior maxillary nerve and some small branches of thesmall occipital nerve. Meatus.—The external auditory canal is about one anda hal
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectear, bookyear1916
