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Why does the knee-jerk reflex still function in a person with a severed spinal cord and why is there no sensation of the stimulus?
Wiki User
∙ 13y ago
Reflexes don't go up the spinal cord to the brain, as the body wants to remove itself from the stimulus as quickly as possible. So, it goes in a loop, called a reflex arc, where the sensory neurons detect the tap and the stimulus is so strong it immediately jumps to the motor neurons to make the leg jerk. It all happens in the spinal cord.
However, you don't feel it because the nerves going up (afferent) and down (efferent) the spinal cord to the brain have been severed and so the brain doesn't detect it.
Wiki User
∙ 13y ago
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