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Updated: May 9, 2025
Highly complex as are the mathematical relations of the vibrations which convey musical tones from the instrument to the ear the final result of those relations, the impression on the rods of Corti's organ in the Cochlea, are as purely physiological as the impressions of touch.
The very complex structure of the cochlea, one of the most elaborate and wonderful outcomes of adaptation in the mammal body, develops originally in very simple fashion as a flask-like projection from the sacculus. As Hasse and Retzius have pointed out, we find the successive ontogenetic stages of its growth represented permanently in the series of the higher Vertebrates.
*The Scala Media.*—This division of the cochlea lies parallel to and between the other two divisions. It is above the scala tympani and below the scala vestibula, and is separated from each by a membrane. The scala media belongs to the membranous portion of the internal ear and is, therefore, filled with the endolymph.
The auditory nerve, or nerve of hearing, passes to the inner ear, through a passage in the solid bone of the skull. Its minute filaments spread at last over the inner walls of the membranous labyrinth in two branches, one going to the vestibule and the ampullæ at the ends of the semicircular canals, the other leading to the cochlea. Mechanism of Hearing.
This end-organ in the cochlea may be compared very fitly to the telephone which receives the message, and that portion of the brain where the auditory tract ends, to the telephone at the distant end of the path, the listener there representing consciousness.
The cochlea is wanting even in the Monotremes, and is restricted to the rest of the mammals and man. The auditory nerve, or eighth cerebral nerve, expands with one branch in the cochlea, and with the other in the remaining parts of the labyrinth.
The internal ear, or bony labyrinth, consists of three distinct parts, or variously shaped chambers, hollowed out in the temporal bone, the vestibule, the semicircular canals, and the cochlea, or snail's shell. A Cast of the External Auditory Canal. The vestibule is the common cavity with which all the other portions of the labyrinth connect.
And yet his is not all, for inside that curled part of the labyrinth, which looks like a snail-shell and is called the cochlea, there is a most wonderful apparatus of more than three thousand fine stretched filaments or threads, and these act like the strings of a harp, and make you hear different tones.
But my neighbors said there was, and the widow Weltraum told me the girl's character would suffer. What could I do? Oh, yes, I recollect all now! I married her, that my old friend's child might have a roof to her head, and come to no harm. You see I was forced to do her that injury; for, after all, poor young creature, it was a sad lot for her. A dull bookworm like me, cochlea vitam agens, Mr.
Over his head was fitted the cochlea shaped shell of some animal, spiraling to a point in front: two small openings had been drilled in it for eye holes. Great, finger-long teeth had been set in the lower edge of the shell to heighten the already fearsome appearance. The only thing at all human about the creature was the matted and filthy beard that trickled out of the shell below the teeth.
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