Naked Science Forum
Life Sciences => Physiology & Medicine => Topic started by: Pseudoscience-is-malarkey on 28/12/2018 16:27:34
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Apparently Darwinism has favored humans with highly-pain sensitive finger tips.
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sensory homunculus (https://en.wikipedia.org/wiki/Cortical_homunculus#Types) here ...
(https://upload.wikimedia.org/wikipedia/commons/thumb/5/51/Front_of_Sensory_Homunculus.gif/800px-Front_of_Sensory_Homunculus.gif)
Is an attempt to illustrate the amount of brain devoted to sensation from various areas of the body.
[ His almost-identical twin-brother, motor homunculus, can be differentiated via his much smaller genitals ]
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Back of the hand is more sensirive any morher knows that
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Back of the hand is more sensirive any morher knows that
Rather than being more sensitive, back of the hand doesn't have muscles to pad it, (unlike the palm),.
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The converse can be seen in cases of diabetic or leprous neuropathy: lack of pain sensation, particularly in the feet, allows the patient to tolerate damage beyond what the system can repair. Passive protection, in the form of industrial boots, prevents damage and subsequent amputation.
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I think really its the ammount of nerve endings that make them so detailed in there sensing. Sensing wise, alot of the sensitivity is dulled by skin thickness and dead layer and as every child knows, mothers have asbestos hands. You can shave your fingertips pain and blood free and they instantly become more sensitive. It would be interesting to see that model sensory homonculus with a more detailed distribution, i bet the fingertips would be huge.
Back of the hand is more sensirive any morher knows that
Rather than being more sensitive, back of the hand doesn't have muscles to pad it, (unlike the palm),.
I thought the nerves that we are on about do not reach the muscles. I am no doctor of medicine but i believe the muscles have very low ammounts of nerves in them
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Maybe, due to all the nerves ending at the fingertips. Hence they are sensitive and get injured instantly.