An academic physiology and hygiene .. . he skull and oval of the face; andthe artist studies the auricle in its relation to these. Anydeparture from its normal outlines is at oi)ce recognizedas an incongruity; and thus in the famous statue of theFaun, by Praxiteles, the pointed tops of the ears give tothe whole a weird and inhuman expression. 2. The location of the innermost regions-of the ear,deep in the solid bone of the skull, has made the extremelycomplex nature of these parts all the more difficult tostudy. Anatomically, the ear is divided into three regions,called respectively the extern
An academic physiology and hygiene .. . he skull and oval of the face; andthe artist studies the auricle in its relation to these. Anydeparture from its normal outlines is at oi)ce recognizedas an incongruity; and thus in the famous statue of theFaun, by Praxiteles, the pointed tops of the ears give tothe whole a weird and inhuman expression. 2. The location of the innermost regions-of the ear,deep in the solid bone of the skull, has made the extremelycomplex nature of these parts all the more difficult tostudy. Anatomically, the ear is divided into three regions,called respectively the external, the middle, and the internalear. HEARING. 337 3. Divisions of the External Ear.—The external ear com-prises the auricle (the part commonly called the ear) andthe auditory canal. The tympanic membrane, or drum-head, stands as a partition between the external and themiddle ear, at the inner end of the auditory canal. 4. The Auricle. — The auricle is a curiously formed shellof cartilage covered with skin which closely fits all the. Fig. 56. EXPLANATION. <7 the external ear. g; the tympanic membrane. /•• the ca?ials of the labyrinth. l\ the middle car (tympanum), in which C. the auditory canal. the little bones are placed. J the cochlea. i, the Eustachian tube. ridges and grooves of the underlying gristle. Concaveon its outward and forward surface, and convex on theopposite side, its shallow, trumpet-mouth form serves asa collector and strengthener of the weaker sounds whichfall upon it—sounds that, in the absence of the auricle,would be lost to hearing. 338 ACADEMIC PHYSIOLOGY. The surface of the auricle is covered with downy hair,and at the entrance of the canal there are stiff hairs whichmight be called the lashes of the ear. These latteraid in protecting the ear against entering dust, insects,etc. 5. The Auditory Canal. — This canal may be said to bethe tube of the acoustic trumpet, of which the auricle isthe flaring mouth. It is a tube about
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