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SENSE ORGANS: SENSE OF HEARING
Hearing is of great importance, and man has developed an elaborate and delicate apparatus for it. The outer ear is of little importance in man, although animals move it about to catch the air vibrations which produce sound. These vibrations may strike the bone in which the other parts of the ear are embedded and hearing may be had by “bone conduction.” The best hearing, however, comes when the waves of air go through the ear canal and cause a membrane, the eardrum, to vibrate. On the inner side of this is a hollow space, kept filled with air through the Eustachian tube which connects with the throat just back of the nostril. As the air at sea level is said to have a pressure of fifteen pounds to the square inch and varies at different levels, it is important to keep the pressure equal on the two sides of the eardrum. The tube ordinarily stays closed, but swallowing or other movements of the throat open it, so now you know why you should chew gum when the airplane leaves or lands on the ground.
This little chamber or space described above is the middle ear. Attached to the inner surface of the eardrum is a minute bone called the malleus, or hammer. It is one of a chain of three bones with joints between them. The middle one is the incus, or anvil; and then comes the stapes, or stirrup, which is attached to another membrane on the inner wall of the middle ear. This membrane covers a fenestra, or window, which would open into the inner ear were it not thus closed. The space for this inner ear is carved from the hardest bone in the body, the petrous portion of the temporal bone. It is filled by a sac or sacs of fluid and along the wall are a number of microscopic structures.
Certainly the best known and probably the most important of these is the sense organ of hearing, called the organ of Corti. Its complex structure is microscopic, but it is said to have as many as fifty thousand “hairs” projecting into the fluid. These hairs connect with the fibers of the eighth or acoustic nerve. Thus the brain is apprised of the physical effects which produce sound. Corti was an Italian of a rich, noble family yet he labored for years in the dissecting room and laboratory until he discovered and described one of the tiniest intricate pieces of apparatus in the body. Having done this he inherited the family fortune with the title of Marchese, dropped entirely his interest in medicine and did not even save his microscope. Perhaps he felt that anything more he did would necessarily be anti-climatic after this monumental work. Perhaps he felt that he was entitled to a broader, varied life.
Yet that gentle sibilation moved air waves to her lover’s ear, causing his tympanic membrane, a very firm structure, to vibrate. Then the three bones of the middle ear relayed the motions accurately, even though one of them was held steady by a muscle, the tensor tympani. The last of the series of bones then had to move another membrane, and this movement set up currents in the fluid of the inner ear causing fifty thousand hairs to wave to and fro. These motions affected the acoustic nerve, and the brain finally received and evidently rapturously responded to this wonderful phenomenon. An elaborate method of transmitting these faint vibrations but it works.
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