All the following are true regarding 5th cranial (Trigeminal) nerve except:
Correct Answer: Arises from midbrain
Description: (Refer: Richard S. Snell’s Clinical Anatomy by Regions, 9th edition, pg no: 607- 610)
Trigeminal nerve
Mesencephalic nucleus is situated in midbrain, spinal nucleus of trigeminal it extends from pons to C3 segments.
It carries parasympathetic fibres to salivary glands.
Four peripheral parasympathetic ganglia (Ciliary, otic, pterygopalatine and submandibular) are topographically connected with 3 divisions of 5th cranial nerve, but they are not functionally related to it.
Pterygopalatine ganglia connected with maxillary nerve (supplies minor salivary glands-pharyngeal and palatine glands).
Otic ganglia connected with mandibular nerve (supplies parotid gland).
Submandibular ganglia connected with lingual nerve (branch of mandibular)-(supplies submandibular and sublingual gland).
Trigeminal nerve (mixed nerve) has large sensory root laterally and small motor root medially.
Mandibular division (has both motor and sensory) of trigeminal nerve innervate muscles of mastication.
Ophthalmic division and maxillary division are purely sensory.
All 3 division-ophthalmic, maxillary and mandibular division provides sensory innervation of face.
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