Which is the largest branch of the internal carotid artery?

Correct Answer: C

Rationale: The middle cerebral artery (MCA) is the largest branch of the internal carotid artery, supplying a significant portion of the cerebral cortex (e.g., lateral aspects). The ophthalmic artery is smaller, and the anterior cerebral and striate arteries are not as large.

Correct Answer: D

Rationale: Motor nerve fibers (alpha motor neurons) are large, myelinated, and typically 12-20 micrometers in diameter to ensure fast conduction to muscles. Smaller diameters are for sensory or unmyelinated fibers.

Correct Answer: B

Rationale: The facial nerve (CN VII) doesn’t supply the ciliary ganglion (CN III does via parasympathetic fibers). It supplies facial muscles, buccinator, taste (anterior 2/3 tongue), and the greater petrosal nerve.

Correct Answer: B

Rationale: The sensory root of CN VII is the nervus intermedius, carrying taste and parasympathetic fibers, exiting via the internal acoustic meatus, not foramen ovale.

Correct Answer: D

Rationale: The midbrain contains oculomotor (CN III) nuclei, lying between the pons and diencephalon in the posterior cranial fossa.