A text-book of the diseases of the ear and adjacent organs . r in these canals. c. The Membranous Structure and the Terminal Apparatus of theAuditory Serve in the Cochlea. The terminal apparatus of the cochlear nerve, generally called the organ ofCorti, lies on the membranous spiral lamina, which springs from the free 594 THE TERMINAL APPARATUS IX THE COCHLEA. edge of the lamina spiralis ossea (Fig. 296) and is inserted on the projectingligainentum spirale (Fig. 305, I, and Fig 306, tr.) of the opposite wall of thecochlea. There are three sections on the membranous spiral lamina: theinner, whi
A text-book of the diseases of the ear and adjacent organs . r in these canals. c. The Membranous Structure and the Terminal Apparatus of theAuditory Serve in the Cochlea. The terminal apparatus of the cochlear nerve, generally called the organ ofCorti, lies on the membranous spiral lamina, which springs from the free 594 THE TERMINAL APPARATUS IX THE COCHLEA. edge of the lamina spiralis ossea (Fig. 296) and is inserted on the projectingligainentum spirale (Fig. 305, I, and Fig 306, tr.) of the opposite wall of thecochlea. There are three sections on the membranous spiral lamina: theinner, which is perforated in numerous places for the passage of the fibres ofthe cochlear nerve (zona perforata); the middle section, which bears the organof Corti (zona arcuata) ; and the external finely striated portion (zonapectinata). We have seen that the cochlear canal is divided by the spiral lamina into the scala vestibuli (Fig. 305, s, c, v) and the scala tympani (s, c, t). The scala estibuli is again divided by the membrana Eeisneri (B) extending from the. Fig. 304.—Section of the Osseous and Membranous Semicircular Canals. a, Osseous semicircular canal ; b, Place of attachment of the membranous semicir-cular canal ; c, Elevations on the inner surface of the membranous semicircularcanal; d, Vascular connective-tissue bands. upper surface of the lamina spiralis ossea obliquely to the external wall of thecochlea, into two divisions, of which the one formed by the membrana basilaris,the external wall of the cochlea and Reisners membrane, is termed canalis orductus cochlearis (Fig. 305, Cc). This canal, lined with epithelium and con-taining the proper terminal apparatus, communicates by the canalis reunienswith the saccule, and ends in a cul-de-sac at the cupola of the cochlea. The position of Cortis organ is best seen from a profile view of a largenumber of vertical microscopic sections. We see (Fig. 306) on such cross-sections on the superior surface of the external section of
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecteardiseases, bookyear
