Page 58 - Human anatomy COMPLETELY DONE1

covered with membranes. The vibrations of the oval window are transmitted to the
fluid, which irritates the auditory receptors located in the cochlea; these, in turn, create
nerve impulses. High sounds cause vibrations of shorter receptor fibers, and low sounds
cause vibrations of longer ones.
There are about 25 thousand sound-receiving cells in the cochlea canal, from
which the fibers of the auditory nerve depart.
The signal along the auditory nerve is transmitted first to the nuclei of the lower
tubercles of the quadrilateral, from there to the auditory nuclei of the thalamus, then to
the temporal lobes of the cerebral cortex, where the highest center of auditory
sensitivity is located.

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