Physiology and biochemistry in modern medicine . the abdomen. They are leastmarked on the exposed surface of the skin, such as the face, and they are 792 THE CENTRAL NERVOUS SYSTEM also very infrequent in the scalp. They are almost absent from the mucousmembranes, which explains why one is able to swallow a liquid that is toohot for the hand. The acuteness of the temperature sensation, as with all the other cu-taneous sensations, depends very much on the condition of the skin,being most sensitive when this is at the ordinary temperature, but veryimperfect when it is either very hot or very col
Physiology and biochemistry in modern medicine . the abdomen. They are leastmarked on the exposed surface of the skin, such as the face, and they are 792 THE CENTRAL NERVOUS SYSTEM also very infrequent in the scalp. They are almost absent from the mucousmembranes, which explains why one is able to swallow a liquid that is toohot for the hand. The acuteness of the temperature sensation, as with all the other cu-taneous sensations, depends very much on the condition of the skin,being most sensitive when this is at the ordinary temperature, but veryimperfect when it is either very hot or very cold. There is also verymarked adaptation of the sense. This can be very well shown by the simpleexperiment of taking three vessels of water, one at a moderate tempera-ture, one very hot and one very cold. If a finger of one hand is placedin the hot water and a finger of the other in the cold, and they are leftthere for a short time, until the skin has assumed the same temperatureas the water, and then transferred to the lukewarm water, the finger.
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