. Human physiology (Volume 1) . s regarded as a distinct bone, undersimilar appellations — Le Rocher, and F e I s e n b e i n. This boneis seated at the base of the skull, so that the internal parts of theauditory organ are deeply and securely lodged. * Wardrops History of James Mitchell, Lond. 1813 ; and Dugald Stewarts Ele-ments of the Philosophy of the Hliman Mind, iii. 401, 3d edit. Lond. 1808. ORGAN OF HEARING. 139 For facility of description, the ear may be divided into threedistinct portions:—1, the external ear, ox that exterior to themembrana tympani; 2, the middle ear — the space con
. Human physiology (Volume 1) . s regarded as a distinct bone, undersimilar appellations — Le Rocher, and F e I s e n b e i n. This boneis seated at the base of the skull, so that the internal parts of theauditory organ are deeply and securely lodged. * Wardrops History of James Mitchell, Lond. 1813 ; and Dugald Stewarts Ele-ments of the Philosophy of the Hliman Mind, iii. 401, 3d edit. Lond. 1808. ORGAN OF HEARING. 139 For facility of description, the ear may be divided into threedistinct portions:—1, the external ear, ox that exterior to themembrana tympani; 2, the middle ear — the space containedbetween the membrana tympani and the internal ear; and 6, theinternal ear itself, in which the auditory nerve is distributed. 1. The external ear. This portion of the auditory apparatus iscommonly looked upon as an acoustic instrument, for collecting thesonorous rays or vibrations, and directing them, in a concentratedstate, to the parts within. It is composed of the pavilion, andmeatus auditorius externus. Fig. Section of the Auditory The pavilion. 2. Meatus auditorius externus. 3. Membrana tympani. 4. Malleus. 5. Stapes; Osorbiculare between the incus and stapes. 7. Cavity of the tympanum. 8-Eustachiantube. 0. Meatus auditorius internus. 10,11, 12. The labyrinth. 10. Vestibule. 11, 11,11. Semi-circular canals. 12. The cochlea. 13. Stapedius muscle. The pavilion varies in size and position in different is the fibro-cartilaginous, thin, and expanded portion, which isan appendage, as it were, to the head. It is irregular on its ante-rior surface ; presenting several eminences and depressions. Theeminences are five in number, and have been called, by anatomists,the helix, anthelix, the tragus, antiiragus, and the lobe. Thehelix forms the rim of the pavilion : the tragus is the small nipple-like projection on the facial side of the meatus auditorius ; the anti-tragus is the projection opposite to this, — forming the lowerport
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectphysiology, bookyear1
