Stimulation of a neuron that terminates close to the longitudinal fissure of the left postcentral gyrus would produce
A)a sensation in the right leg.
B)a sensation in the lips.
C)a muscle twitch in the right leg.
D)a muscle twitch in the lips.
E)both sensations and muscle twitches in the right leg.

Question

Quizplus · Accepted Answer

The left postcentral gyrus is part of the primary somatosensory cortex, which is responsible for processing sensory information from the body. The body is represented somatotopically along the postcentral gyrus, with the lower body (including the legs) represented near the medial surface close to the longitudinal fissure. Since the sensory cortex is contralateral, stimulation here would produce a sensation in the opposite (right) leg, not a muscle twitch or sensations in the lips.

Stimulation of a Neuron That Terminates Close to the Longitudinal