The cerebral hemispheres are separated by the

Correct Answer: B

Rationale: The longitudinal fissure is the deep groove separating the cerebral hemispheres. The corpus callosum connects them.

Correct Answer: C

Rationale: The hypothalamus is part of the diencephalon, below the thalamus, regulating autonomic and endocrine functions.

Correct Answer: B

Rationale: Glossopharyngeal (CN IX) has motor (pharynx) and sensory (taste, throat) roles. Vestibulocochlear (hearing/balance), optic (vision), and olfactory (smell) are sensory only.

Correct Answer: B

Rationale: Cervical has 8 pairs (C1-C8), not 7. Lumbar (5), thoracic (12), and sacral (5) are correct.

Correct Answer: C

Rationale: The parasympathetic system uses acetylcholine only, not norepinephrine (sympathetic). It has long preganglionic and short postganglionic neurons, cranial/sacral origins, and rest-and-digest function.