Question 6 Answer, Neurology

Eccentric topic of the Week, Neurology
Question 6:

Regarding the trigeminal nerve:

A. True: It is the largest cranial nerve

B. True: It contains two roots

C. False: It carries parasympathetic fibers to the sublingual glands

D. True: Its lesion can cause deviation of the jaw on opening of the mouth

E. False: It carries the efferent elements of the corneal reflex

The trigeminal nerve emerges from the mid-lateral surface of the pons and is the largest cranial nerve. It has two components that emerge closely but have distinctly separate roots: the branchial motor and the general sensory. The trigeminal nerve forms the afferent loop of the corneal reflex. It does not carry parasympathetic fibers to any structure.*

*Fix JD. Appendix: table of cranial nerves.In: High Yield Neuroanatomy, 2nd edition. Philadelphia: Lippincott Williams & Wilkins, 2000: 133.

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