Clusters of neuron cell bodies embedded in the white matter of the brain are referred to as:

Correct Answer: A

Rationale: In the CNS, clusters of neuron cell bodies are called nuclei (e.g., basal nuclei). Gyri are cortical ridges, ganglia are PNS neuron clusters, and fasciculi are axon bundles.

Correct Answer: D

Rationale: CSF circulates in the ventricles, central canal of the spinal cord, and subarachnoid space, cushioning the CNS. The epidural space and dural sinuses do not normally contain CSF.

Correct Answer: B

Rationale: The conus medullaris is the tapered, terminal end of the spinal cord (around L1-L2). The cauda equina is nerve roots below it, and the filum terminale is a fibrous extension.

Correct Answer: A

Rationale: Multiple sclerosis (MS) is characterized by demyelination and plaque formation in the CNS, causing neurological deficits. Epilepsy involves seizures, cerebral palsy is a developmental disorder, Parkinson’s affects dopamine, and neurosyphilis is infection-related.