With regards to the spinal cord blood supply

Correct Answer: B

Rationale: The anterior spinal artery (singular) arises from the vertebral arteries, supplying the anterior spinal cord. There are two posterior spinal arteries, typically from the posterior inferior cerebellar arteries, not superior cerebellar.

Correct Answer: B

Rationale: The vagus nerve (CN X) arises from the medulla, with nucleus ambiguus fibers (shared with CN XI origins) for pharyngeal/laryngeal muscles. It doesn’t supply the diaphragm (phrenic nerve) or face.

Correct Answer: D

Rationale: The auriculotemporal nerve is a mandibular (V3) branch, supplying the scalp and TMJ. Infraorbital (V2), external nasal (V1), and zygomaticofacial (V2) are not V3.

Correct Answer: D

Rationale: Trochlear (CN IV) paralysis prevents downward gaze when the eye is adducted (superior oblique). Abducens (VI) paralysis causes medial deviation.

Correct Answer: D

Rationale: The internal carotid artery gives off the ophthalmic artery before forming the circle of Willis.