This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroanatomy, Subject name: Anatomy
Thickest cranial nerve is- 
Select and explain. 
A. Trochlear nerve, B. Vagus, C. Facial nerve, D. Trigeminal nerve
D: Trigeminal nerve
Answer: D: Trigeminal nerve 
Explanation: Ans. is 'd' i.e., Trigeminal nerve * Longest intracranial course-Trochlear nerve* Longest course overall and most widely distributed-Vagus* Smallest (thinnest) cranial nerve-Trochlear nerve* Largest (thickest) cranial nerve-Trigeminal nerve* The only cranial nerve arising from dorsal aspect-Trochlear nerve* Only cranial nerve decussating completely before emerging-Trochlear nerve* Cranial nerve most commonly involved in basal skull fracture-Facial nerve* Cranial nerve most commonly involved in raised intracranial tension-Abducent nerve* Commonest cranial nerve affected in spinal anaesthesia-Abducent nerve* Cranial nerve most commonly involved in intracranial aneurysm-Oculomotor nerve* Cranial nerves carrying parasympathetic fibers-3, 7, 9, 10