An American text-book of physiology . ex of thisbright triangle is at the tip of the manu-brium, and its base is on or near theperipheiy of the membrane. Auditory Ossicles. — The tympanicmembrane is put into relation with theinternal ear by a chain of bone, theauditory ossicles, known as the malleus,the incus, and the stapes, so called fromtheir fancied resemblance to a hammer, ananvil, and a stirrup (Figs. 267, 269, 270).The malleus (Fig. 271) is 18 to 19 milli-meters long; it presents a rounded head,grooved on one side for articulation withthe incus, a short neck, and a long handleor manubri
An American text-book of physiology . ex of thisbright triangle is at the tip of the manu-brium, and its base is on or near theperipheiy of the membrane. Auditory Ossicles. — The tympanicmembrane is put into relation with theinternal ear by a chain of bone, theauditory ossicles, known as the malleus,the incus, and the stapes, so called fromtheir fancied resemblance to a hammer, ananvil, and a stirrup (Figs. 267, 269, 270).The malleus (Fig. 271) is 18 to 19 milli-meters long; it presents a rounded head,grooved on one side for articulation withthe incus, a short neck, and a long handleor manubrium, which is inserted in thetissue of the tympanic membrane froma point on its upper periphery to a little below its centre. The processusbi-evis of the malleus is a low conical projection which springs from the topof the manubrium and presses directly against that segment of the tympanicmembrane known as the membrana Jlaccida, through which it can be seenshining on inspection with the ear-speculum. The processus gracilis, or pj-o-. FiG. 271.—Malleus of the right side: a, anteriorface; b, internal face (after Testut): 1, capitu-lum or head of malleus; 2, cervix or neck; 3,processus brevis; 4, processus gracilis; 5, manu-brium ; 6, grooved articular surface for incus;7, tendon of m. tensor tympani. THE SENSE OF HEARING. 811
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Keywords: ., bookautho, bookcentury1800, bookdecade1890, booksubjectphysiology
