When you raise your hand to ask a question in class,your brain sends an impulse to your deltoid muscle by way of
A) ascending tracts.
B) sensory nerves.
C) descending tracts.
D) cranial nerves.

Question

Quizplus · Accepted Answer

The deltoid muscle is part of the upper limb, which is controlled by the motor cortex located in the precentral gyrus of the frontal lobe. When you raise your hand to ask a question, your brain sends an impulse via the corticospinal or pyramidal tract, which is a descending tract that originates in the motor cortex and descends through the spinal cord, eventually synapsing on the motor neurons that control the deltoid muscle. Therefore, the correct answer is C) descending tracts.

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