Introduction

There are 12 pairs of Cranial nerves in human body.

NUCLIE OF THE CRANIAL NERVES

1st & 2nd Cerebral cortex
3rd & 4th Midbrain
5th, 6th, 7th, 8th Pons
9th, 10th, 11th, 12th Medulla Oblongata


PURE SENSORY NERVES

1st Olfactory nerve:
Sense of smell
2nd Optic nerve:
Sense of vision
8th Vestibulocochlear nerve:
Balance & Hearing


PURE MOTOR NERVES

3rd Occulomotor :
It is motor to all the extra ocular muscles of eye except Superior Oblique and Lateral Rectus Muscle. It is also supplying ciliary muscles and sphincter pupillae with parasympathetic fibers.

4th Trochlear :
Motor to Superior oblique

6th Abducent:
Motor to Lateral Rectus

11th Accessory:
Motor to Sternomastoid and Trapezius muscles

12th Hypoglossal:
Motor to muscles of tongue


MIXED MOTOR AND SENSORY NERVES

5th Trigeminal:
Motor to muscles of mastication
Sensory to face, anterior part of head and inside mouth.

7th Facial :
Motor to Muscles of facial expression and Stapedius muscle
Sensory to Part of external ear and taste to anterior two thirds of tongue.



9th Glossopharyngeal :
Motor to Stylopharyngeus
Sensory to Pharynx, Soft palate; Taste to Posterior one third of the tongue.


10th Vagus:
Motor to muscles of Pharynx, soft palate and larynx.

NERVES CARRYING PARASYMPATHETIC FIBERS

3rd Occulomotor :
Ciliary muscles and Sphincter Pupillae

7th Facial:
Lacrimal Gland
Submandibular Gland
Sublingual Gland

9th Glossopharyngeal:
Parotid Gland

10th Vagus:
Thorax & Abdomen