Which of the following is true of the spinal nerves?
A) Incoming sensory signals arrive via the ventral roots of the spinal cord.
B) The cell bodies of efferent fibers lie in the gray matter of the spinal cord.
C) Outgoing motor signals travel via the dorsal roots of the spinal cord.
D) The cell bodies of efferent fibers lie in the spinal cord white matter.
E) The spinal nerves are wholly sensory. .

Question

Quizplus · Accepted Answer

The cell bodies of efferent fibers (motor neurons) are located in the gray matter of the spinal cord, while the cell bodies of afferent fibers (sensory neurons) are located outside the spinal cord, in dorsal root ganglia. Incoming sensory signals arrive via the dorsal roots of the spinal cord and outgoing motor signals travel via the ventral roots. The spinal nerves contain both sensory and motor fibers. Therefore, choices A, C, D, and E are incorrect.

Which of the Following Is True of the Spinal Nerves