Archive image from page 878 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( OSSEOUS LABYKINTH. 845 varying distance, they bend outwards to reach the attached edge of the lamina spiralis ossea, where they expand and form by their apposition a spiral canal, the canalis spiralis cochlea, which lodges the ganglion spirale cochleae. From this spiral canal numerous small foramina, for the transmission of vessels and nerves, pass outwards to the free edge of the lamina spiralis ossea. The lamina spiralis ossea, a thin, fiat shelf of
Archive image from page 878 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( OSSEOUS LABYKINTH. 845 varying distance, they bend outwards to reach the attached edge of the lamina spiralis ossea, where they expand and form by their apposition a spiral canal, the canalis spiralis cochlea, which lodges the ganglion spirale cochleae. From this spiral canal numerous small foramina, for the transmission of vessels and nerves, pass outwards to the free edge of the lamina spiralis ossea. The lamina spiralis ossea, a thin, fiat shelf of bone, winds round the modiolus like the thread of a screw, and, projecting about half-way into the cochlear tube, incompletely divides it into two passages—an upper is named the scala vestibuli; a lower, the scala tympani. The lamina spiralis ossea begins at the floor of the vestibule, near the fenestra cochleae, and ends close to the apex of the cochlea in a sickle-shaped process, the hamulus laminae spiralis, which assists to bound an aperture named the helicotrema. In the - Cupula Canalis centralis Canalis spiralis cochleae Section through promontory Lamina spiralis ossea secundaria Fissura vestibuli Lamina spiralis ossea Recessus cochlearis of vestibule Fig. 718. Modiolus Scala vestibuli Lamina spiralis ossea Scala tympani Tractus spiralis foraminosus Internal acoustic meatus -Section of Bony Cochlea. Area vestibularis superior Area n. facialis basal coil the upper surface of the lamina spiralis ossea forms almost a right angle with the modiolus, but the angle becomes more and more acute on ascending the tube. In the lower half of the basal coil a second smaller bony plate, the lamina spiralis secundaria, projects from the outer wall of the cochlea towards the lamina spiralis ossea, without, however, reaching it. If viewed from the vestibule the slit-like fissura vestibuli, already referred to (p. 844), is seen between the two laminae. A membrane, the membrana basilari
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