Cranial Nerves

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Cranial Nerves - Sensory

I, II, VIII
(1,2,8)

Cranial Nerves - Motor

III, IV, VI, XI, XII
(3,4,6,11,12)

Cranial Nerves - Mixed

V, VII, IX, X
(5,7,9,10)

Cranial Nerve I

Olfactory Nerve:
--Sensory
--Sense of smell
--Damage causes impaired sense of smell

Cranial Nerve II

Optic Nerve:
--Sensory
--Provides vision
--Damage causes blindness in part or all of the visual field

Cranial Nerve III

Oculomotor Nerve:
--Motor
--Controls majority of eye muscles
--controls muscles that turn the eyeball up, down, & medially
--controls the iris, lens, upper eyelid
--Damage causes dropping eyelid, dilated pupil, double vision, difficulty focusing and inability to move eye in certain directions

Cranial Nerve IV

Trochlear Nerve:
--Motor
--eye movement (superior oblique muscle)
--Damage causes double vision & inability to rotate eye inferolaterally

Cranial Nerve V

Trigeminal Nerve:
--Mixed
--largest of the cranial nerves
--most important sensory nerve of the face
--Branches into 3 divisions (V1, V2, V3)

CN V, V1 Division

Ophthalmic division
--sensory

CN V, V2 Division

Maxillary Division
--sensory

CN V, V3 Division

Mandibular Division
--mixed

Cranial Nerve VI

Abducens Nerve:
--Mixed
--Provides eye movement (lateral rectus muscle)
--Damage results in inability to rotate eye laterally & at rest eye rotates medially

Cranial Nerve VII

Facial Nerve:
--Mixed Nerve
--Major motor nerve of facial muscles (frontalis, orbicularis oculi, etc.): facial expressions, salivary glands & tear/nasal/palantine glands
--Sensory - taste on anterior 2/3's of tongue
--Damage produces sagging facial muscles & disturbed sense of taste (no sweet/salty)
--comes out of styloid mastoid foramen

Cranial Nerve VIII

Vestibulocochlear Nerve:
--Sensory
--Nerve of hearing & equilibrium
--Damage produces deafness, dizziness, nausea, loss of balance & nystagmus

Cranial Nerve IX

Glossopharyngeal Nerve:
--Mixed
--Swallowing, salivation, gagging, control of BP & respiration
--Sensations from posterior 1/3 of tongue
--Damage results in loss of bitter & sour taste. impaired swallowing

Cranial Nerve X

Vagus Nerve:
--Mixed Nerve
--*Parasympathetic* " Delivers all PS info to organs
--Longest cranial nerve/most extensive distribution of any cranial nerve
--Major role in control of cardiac, pulmonary, digestive, & urinary function
--swallowing, speech, regulation of viscera
--Damage causes hoarseness or loss of voice, impaired swallowing & fatal if both are cut

Cranial Nerve XI

(Spinal) Accessory Nerve:
--Motor
--Innervates SCM/Trapezius
--Swallowing, head, neck, shoulder movement
--Damage causes impaired head, neck, shoulder movement; head turns towards injured side

Cranial Nerve XII

Hypoglossal Nerve:
--Motor
--Tongue movement for speech, food manipulation & swallowing
--If both are damaged - can't protrude tongue
--if one side is damaged - tongue deviates towards injured side (ipsilateral atrophy)

LR6 SO4 R3

how to remember names of muscles and what C.N. controls them

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