1. THE CNS

2. EXCEPTION-CRANIAL NERVES

3. The 1st cranial nerve-the olfactory

4. The 2nd cranial nerve-optic

5. The 3rd cranial nerve-the occulomotor

6. The 4th cranial nerve-trochlear

7. The 6th cranial nerve- Abducens
Has only a somatic motor (general somatic efferent) component. Somatic motor: innervates the lateral rectus muscle of the ipsilateral orbit. The lateral rectus muscle is one of the six extraocular muscles responsible for the precise movement of the eye for visual tracking or fixation on an object.

8. The 5th cranial nerve-the trigeminal

9. The 7th cranial nerve-Facial

10. The 8th cranial nerve-the auditory (vestibulo-chochlear)

11. The 9th cranial nerve-the glossopharyngeal

12. The 10th cranial nerve-the Vagus

13. The 11th cranial nerve- the accessory

16. 12th Cranial nerve-hypoglossal

17. The hypoglossal nerve controls the intrinsic musculature of the tongue and is evaluated by having the patient "stick out their tongue" and move it side to side. Normally, the tongue will be protruded from the mouth and remain midline. Note deviations of the tongue from midline, a complete lack of ability to protrude the tongue, tongue atrophy and fasciculations on the tongue. The tongue will deviate towards the side of a peripheral lesion, and to the opposite side of a central lesion.