A treatise on the diseases of the ear including the anatomy and physiology of the organ together with the treatment of the affections of the nose and pharynx which conduce to aural disease . mhead, and connected with the internal wallby means of a chain of three small bones. The outer bone of thechain (k) is closely attached to the membrana tympani, while theinner one (s) is applied to an opening in the outer wall of the\estibule. The ossicles are articulated together by joints, ad-mitting of certain movements under the action of small muscles,\Nhich thus alter the tension of the membrana tymp
A treatise on the diseases of the ear including the anatomy and physiology of the organ together with the treatment of the affections of the nose and pharynx which conduce to aural disease . mhead, and connected with the internal wallby means of a chain of three small bones. The outer bone of thechain (k) is closely attached to the membrana tympani, while theinner one (s) is applied to an opening in the outer wall of the\estibule. The ossicles are articulated together by joints, ad-mitting of certain movements under the action of small muscles,\Nhich thus alter the tension of the membrana tympani and thel)ressure of the lymph of the labyrinth. The ossicles serve to^ommunicate vibrations from the former to the latter of these IXTRODUCTIOX. 3 structures. On the outer side of the tympanic membrane is acanal (A(i), the external meatus, witli an expanded portion forcollecting vibrations and conducting them to the internal i)urposes of description the organ of hearing is dividedinto three portions, termed respectively the external, middle, andinternal ear, these being separated from each other in the mannerabove described. From a physiological point of view, the organ. Fig. 1. SCHKME OF THE OK(iAX OK HEARING. AG, external auditory meatus; T, tympiinic membrane; K. malleus with its head (A), shortprofess (A/), and handle (>ii); a, incus with its short process (s) and louo; process—the latter isunited 1o the stajies («•) hy means of the Sylvian ossicle (^); P, middle ear; o, fenestra ovalis ;r, fenestra rotunda ; r, bef(innin{/ of the lamina spiralis of the cochlea ; pt, its scala tymjjani,and vt, its scala vestibuli; V, vestibule; S, saccule; U, utricle; H, senii-circidar canals;TE, Eustachian tube. The lonj^ arrow indicates the line of action of the tensor tympani; theshort curved one that of the staix-dius. {Llndois and IStirling.) may be regarded as consisting of a sound-condtictinr/ and a sound-jierceiving api)aratus; the former including the external
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Keywords: ., boo, bookcentury1800, bookdecade1890, booksubjectear, bookyear1894
