. Human physiology. Fig. 202.—Outer sur-face of the Pinna ofthe Bight Ear. 1, helix ; 2, antihelix; 3, tra-gus ; 4, antitragus; 5, con-cha ; 6, lobule. Fig. 203.—Outer sur-face of the BightPinna, showing itsmuscles. Fig. 204.—Inner sur-face of the BightPinna,. Fig. 205.—Diagrammatic front view of the Left Ear. A portion of the temporal bone has been detached. 1, the pinna and lobe ; 2 to 2, the auditory canal ; 2, the tympanic membrane ; 3, the cavityof the middle ear—above 3 is the chain of small bones; 4, Eustachian tube ; 5, the facialand auditory nerves; 6, placed on the vestibule of the l
. Human physiology. Fig. 202.—Outer sur-face of the Pinna ofthe Bight Ear. 1, helix ; 2, antihelix; 3, tra-gus ; 4, antitragus; 5, con-cha ; 6, lobule. Fig. 203.—Outer sur-face of the BightPinna, showing itsmuscles. Fig. 204.—Inner sur-face of the BightPinna,. Fig. 205.—Diagrammatic front view of the Left Ear. A portion of the temporal bone has been detached. 1, the pinna and lobe ; 2 to 2, the auditory canal ; 2, the tympanic membrane ; 3, the cavityof the middle ear—above 3 is the chain of small bones; 4, Eustachian tube ; 5, the facialand auditory nerves; 6, placed on the vestibule of the labyrinth, above the fenestraoval is ; a, c, e m\&f, portions of the temporaldxme • bt internal carotid artery ; d, branchof the facial nerve. 2l8 ELEMENTARY PHYSIOLOGY The auditory canal extends inward from the pinna to a distance of aboutli inch. Its inner extremity is closed by a very thin membrane called thedJum of the ear (or the tympanic membrane), which is stretched across itobliquely. The walls of the canal are formed partly by cartilage and part yby bone, and are lined with a continuation of the skin. This skm, at meouter portion of the canal, is provided with small hairs, and also a number ofglands, similar in structure to the sweat
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