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Updated: May 9, 2025
The membranous portion consists of a series of canals communicating with some similarly membranous sacs, the whole being surrounded by and filled with fluid. These latter communicate with an extension termed the cochlea, which contains a central canal in which that collection of cells is found which constitutes the end-organ, among them the hair-cells, about which the nerve ends.
"This reversed vault forms the pavilion well enough; the under side of the steps makes the covering of the tympanum, and the winding of the staircase the cochlea, the labyrinth, and vestibule of the ear. That is the cause of the murmur which we hear: we are at the back of a colossal ear." "It's very likely," said Hans Goerner, who did not seem to have understood my observations.
This membrane extends the length of the cochlear canals, and is stretched between a projecting shelf of bone on one side and the outer wall of the cochlea on the other. It is covered with a layer of epithelial cells, some of which have small, hair-like projections and are known as the hair cells.
For the portio mollis of the auditory nerve is not spread upon the tympanum, but upon the vestibulum, and cochlea, and semicircular canals of the ear; while between the tympanum and the expansion of the auditory nerve the cavity is said by Dr. Cotunnus and Dr.
Both the scala vestibula and the scala tympani belong to the outer portion of the internal ear and are, for this reason, filled with the perilymph. At their upper ends they communicate with each other by a small opening, making by this means one continuous canal through the cochlea. This canal passes from the vestibule to the tympanum and, in so doing, goes entirely around
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