Johnny gets blindfolded then poked with a probe 3 times. 2 times in the finger 1...

Johnny gets blindfolded then poked with a probe 3 times. 2 times in the finger 1 time in the foot. All with different pressures. Explain how he can tell to pressure and location of the probe given that he is blindfolded.

Expert Solution

Any sensation from our body is carried to the central nervous system to localise the location (whether it's from hand or foot or any other region) and to identify the nature of the sensation (pain, temperature, touch, pressure, vibration etc) .

The sensation of pressure is carried by a pathway called as anterior spinothalamic tract.
first, the pressure receptors in the skin convert the mechanical energy (of pressure) into electrical nerve impulses.
there are different types of receptors to carry different sensations. there are separate receptors and separate nerve pathway for different locations of the body.
these impulses from these receptor enter the spinal chord (through the dorsal root of spinal cord), cross over to the opposite side and ascends till the thalamus of the brain though the anterior spinothalamic tract.
from thalamus, another neuron transmits these impulses to the Sensory cortex of the brain( Brodmann area 3, 1 and 2.)
the sensory cortex identifies the location from where the stimulus is coming from.

*I hope it solves your query. If you have anymore doubts related to this question, add a comment and I will get back to you as soon as I can.

Sydney Mullin answered 2 years ago

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