Cranial Nerve Type

By Pankaj Kukreti

What Are Cranial Nerve ?- Cranial Are The Type Of Nerve , Which Comes Out From The Brain Rather Than Spinal Cord

- These Nerve Only Seen From Bottom Side Of Brain

- In Human There Are About 12 Pair Of Cranial Nerve Found

Numbering Of Cranial Nerve ?- Traditionally, These Nerve Are Abbreviated by their corresponding Roman numerals.

- They are numbered according to where their nuclei lie in the brain stem

Types :-- In Agantha (jaw less) Animal :- There are about 8-10 pair cranial nerve- In Gnathostomata Animal :- There are about 10-12 pair cranial nerve - In Anamniotes :- 10 Pair of Cranial Nerve Found- In amniotes. :- Cranial nerves XI and XII . - Note :- CN XI controls some muscles of the shoulder girdle CN XII) is involved in control of the tongue

Names & Function :-I -Olfactory - olfaction (smell)

II -Optic - vision (Contain 38% of all the axons connecting to the brain.)

III -Oculomotor - eyelid and eyeball muscles

IV -Trochlear - eyeball muscles

V -Trigeminal - facial and mouth sensation , chewing

VI -Abducens - eyeball movement

Names & Function-2 :-VII-Facial - taste, facial muscles and salivary glands

VIII -Auditory - hearing and balance

IX -Glossopharyngeal - taste, swallowing

X -Vagus - main nerve of the parasympathetic nervous system (PNS)

XI -Accessory - moving head and shoulder

XII -Hypoglossal - tongue muscles

Disorder Of Cranial Nerve :-- TRIGEMINAL NEURALGIA

(Tic Douloureux)- GLOSSOPHARYNGEAL NEURALGIA- Bell's Palsy- Menieres Disease- Vertigo And Dizziness