Title: THE CNS
1THE CNS
2EXCEPTION-CRANIAL NERVES
3The 1st cranial nerve-the olfactory
4The 2nd cranial nerve-optic
5The 3rd cranial nerve-the occulomotor
6The 4th cranial nerve-trochlear
7The 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.
8The 5th cranial nerve-the trigeminal
9The 7th cranial nerve-Facial
10The 8th cranial nerve-the auditory
(vestibulo-chochlear)
11The 9th cranial nerve-the glossopharyngeal
12The 10th cranial nerve-the Vagus
13The 11th cranial nerve- the accessory
14(No Transcript)
15(No Transcript)
1612th 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.