The spinothalamic tract:

Correct Answer: B

Rationale: The spinothalamic tract carries pain and temperature (B, correct), not pressure (A, dorsal columns). It terminates in the thalamus (C, also true), but tuning fork tests vibration (D, dorsal columns). B is most specific.

Correct Answer: A

Rationale: Hopping reaction is midbrain (A, correct), tonic neck is medullary/spinal (not just spinal, B), optical righting is cortical (C, true but less specific), stretch reflex is spinal (not medulla, D). A is correct.

Correct Answer: A

Rationale: The diencephalon develops into the thalamus, hypothalamus, and parts of the retina (A). Midbrain (B) arises from the mesencephalon, pons and cerebellum (C) from the rhombencephalon (metencephalon), and cerebrum (D) from the telencephalon. A is correct.

Correct Answer: C

Rationale: The internal carotid artery (C) enters the cranium via the carotid canal, supplying the brain. The common carotid (A) branches into it but doesn’t enter, jugular vein (B) drains blood, and aorta (D) is systemic. C is correct.

Correct Answer: A

Rationale: A fascicle (A) is a bundle of axons within a peripheral nerve. Tracts (B) are CNS axon bundles, nerve roots (C) are spinal nerve origins, and epineurium (D) is the nerve’s outer layer. A is correct.