The dorsal root of a spinal nerve primarily contains:

Correct Answer: A

Rationale: Dorsal roots carry sensory (afferent) fibers to the CNS. [Level: Knowledge]

Correct Answer: C

Rationale: The sympathetic chain ganglia form the sympathetic trunk, housing postganglionic neurons. [Level: Knowledge]

Correct Answer: C

Rationale: The nervous system senses (input), integrates, and responds (motor output). [Level: Knowledge]

Correct Answer: C

Rationale: Oligodendrocytes myelinate CNS axons; Schwann cells do so in the PNS. [Level: Knowledge]

Correct Answer: D

Rationale: CSF flows through ventricles, subarachnoid space, and central canal. [Level: Knowledge]