Question

the posterior root of a spinal nerve contains
interneurons.
cell bodies of sensory neurons.
axons of sensory neurons.
axons of motor neurons.
cell bodies of motor neurons.

Explanation:

Spinal nerve roots:

• Posterior (dorsal) root: Carries sensory information. It contains axons of sensory neurons. Sensory neurons have their cell bodies in the dorsal root ganglion (not in the posterior root itself). Interneurons are mainly within the CNS (not in the root). Motor neuron axons are in the anterior (ventral) root, and motor neuron cell bodies are in the spinal cord anterior horn.

Answer:

axons of sensory neurons.