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SENSE ORGANS: SENSES OF SMELL AND TASTE
Man cannot live by himself alone, but only by contact and association with the outside world. The nervous system as described above could never give him this contact. It has to be done by the sense organs.
From the time of Aristotle it has been customary to speak of man’s five senses: sight, smell, hearing, taste, and touch. The tiny sense organs in the eyes, the nose, the ears, the mouth, and the skin receive their stimulation from the outside; then the sensory nerves transmit the stimuli to the brain which is where man becomes aware of these sensations. Perhaps Aristotle and his fellow-Greeks could live their simple lives with five kinds of sense organs. We are told that the modern man has about twenty-five.
The sense of smell
In the animal kingdom as a whole probably smell is the most important sense. It would seem to be of minor importance in man, who considers it almost entirely from the aesthetic point of view. It pleases him to smell the perfume of flowers; it contributes to his taste of some of the flavoriest foods. At the other extreme, bad smells may be the most disgusting of sensations. The smell organ is a portion of the lining of the nose called the Schneiderian membrane, unimportant yet always remembered by a medical student.
The sense of taste
Most of the tasting is done by numerous little bumps on the tongue, and different parts of the tongue seem to specialize in sweet, sour, salt, etc. Some of the pleasantest tastes are due largely to smell – for instance, wine and onions. Smell and taste are relatively unimportant in man and there is evidence that they are becoming more so.
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