السؤال 38

A nerve carries a command from the spinal cord to a muscle in the arm. Why is that nerve part of the peripheral nervous system?

It is located only within the brain.
It carries a motor command rather than any information.
It lies outside the brain and spinal cord.الإجابة الصحيحة
It is found in a limb, and peripheral nerves occur only in limbs.

الشرح

The nerve lies outside the brain and spinal cord, which places it in the peripheral nervous system even though it connects to the central system. Peripheral nerves are not restricted to sensory traffic, because they can also carry motor commands.

الشرح

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