In the spinal cord:

Correct Answer: A

Rationale: Brown-Sequard syndrome (cord hemisection) causes ipsilateral motor/touch/proprioception loss (corticospinal/dorsal columns) and contralateral pain/temperature loss (spinothalamic). The cord ends at L1-L2, and corticospinal is key.

Correct Answer: D

Rationale: Damage to Broca’s area (frontal lobe) causes motor (expressive) aphasia. It’s typically left-sided regardless of handedness, anterior, and Wernicke’s handles comprehension.

Correct Answer: C

Rationale: Superior cerebral veins lie in the subarachnoid space (arachnoid mater), draining into the superior sagittal sinus.

Correct Answer: D

Rationale: Neurons communicate electrically within the cell (via action potentials) and chemically between cells (via neurotransmitters at synapses). 'Radio-wave-like impulses' is incorrect, so 'A and B' is the accurate choice.

Correct Answer: B

Rationale: Microglial cells are neuroglia in the CNS that perform phagocytosis, engulfing debris and pathogens. Cranial nerves are PNS structures, microtubules are cytoskeletal components, and electrical excitability is a neuron property, not a cell type.