Quain's elements of anatomy . oval of the surrounding parts of the petrousbone. 1, the pinna and lobe ; 2 to 2, meatus externus ; 2, membrana tympani ; 3,cavity of the tympanum ; above 3, the chain of small bones ; 3, opening into the mastoidcells ; 4, Eustachian tube ; 5, meatus internus, containing the facial (uppermost) andauditory nerves ; 6, placed on the vestibule of the labyrinth above the fenestra ovalis ; a,apex of the petious bone ; b, internal carotid artery ; c, styloid process ; d, facial nerveissuing from the stylo-mastoid foramen ; e, mastoid process ; /, squamous part of the bo
Quain's elements of anatomy . oval of the surrounding parts of the petrousbone. 1, the pinna and lobe ; 2 to 2, meatus externus ; 2, membrana tympani ; 3,cavity of the tympanum ; above 3, the chain of small bones ; 3, opening into the mastoidcells ; 4, Eustachian tube ; 5, meatus internus, containing the facial (uppermost) andauditory nerves ; 6, placed on the vestibule of the labyrinth above the fenestra ovalis ; a,apex of the petious bone ; b, internal carotid artery ; c, styloid process ; d, facial nerveissuing from the stylo-mastoid foramen ; e, mastoid process ; /, squamous part of the bone. THE EXTEEKAL EAR. In the external ear are included the pinna-—the part of the outer earwhich projects from the side of the head—and the meatus or passage whichleads thence to the tympanum, and which is closed at its inner extremityby a membrane interposed between it and the middle ear. * The elder literature of the eye will be found in the several articles referred to in theHandbuch der gesammten Augenheilkunde, STRUCTURE OF THE PINNA. 431 THE PINNA. The general form of the pinna or auricle, as seen from the outside, isconcave, to fit it for collecting and concentrating the undulations ofsound, but it is thrown into various elevations and hollows, to whichdistinct names have been given. The largest and deepest concavity iscalled the concha (fig. 370, 7) ; it surrounds the entrance to the meatus,and is interrupted at its upper and anterior part by a ridge, which is thebeginning of the helix. In fiont of the concha, and projecting back-wards over the meatus, is a conical prominence, the tragus (fig. 370, 6),covered usually with hairs. Behind this, and separated fi-om it by a Fig. 370.—Outer surface op the pinna of the right Fig. 370. AURICLE. I 1, helix ; 2, fossa of the helix ; 3, antihelix ; 4, fossaof the antihelix ; 5, antitragus : 6, tragus ; 7, concha ;8, lobule. deep notch, is another smaller elevation, the aniitragus (5). Beneath the antitragus, and formi
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