Cranial Nerves

Front 1

CN I: name + functional classification

Back 1

Olfactory n., sensory

Front 2

CN II: name + functional classification

Back 2

Optic n., sensory

Front 3

CN III: name + functional classification

Back 3

Oculomotor n., somatic + visceral motor

Front 4

CN IV: name + functional classification

Back 4

trochlear n., somatic motor

Front 5

CN V: name + functional classification

Back 5

Trigeminal n., senosry + somatic motor

Front 6

CN VI: name + functional classification

Back 6

Abducens n., somatic motor

Front 7

CN VII: name + functional classification

Back 7

Facial n., sensory, somatic + visceral motor

Front 8

CN VIII: name + functional classification

Back 8

vestibulocochlear n., sensory

Front 9

CN IX: name + functional classification

Back 9

glossopharyngeal n., sensory, somatic + visceral motor

Front 10

CN X: name + functional classification

Back 10

vagus n., sensory, somatic and visceral motor

Front 11

CN XI: name + functional classification

Back 11

accessory n., somatic motor

Front 12

CN XII: name + functional classification

Back 12

hypoglossal n., somatic motor

Front 13

CN I: specifically responsible for what?

Back 13

sensory for the sense of smell from olfactory mucosa, predominantly in the caudal region of the nasal cavity (special visceral afferent)

Front 14

CN I: nerves travel through....

Back 14

the cribriform plate to reach the olfactory bulbs of the telencephalon

Front 15

CN I: dysfunction, how is it tested?

Back 15

causes absence of sense of smell (anosmia); use aromatic compounds to determine sense of smell is present

Front 16

CN II: responsible for what?

Back 16

sensory for sense of sight from rods and cones in the nervous retina (special somatic afferent)

Front 17

CN II: nerves travel through...

Back 17

optic canals, partially decussate/cross at the optic chiasma and reach the lateral geniculate mucleus and rostral colliculus

Front 18

CN II: dysfunction causes? tests?

Back 18

blindnes (anopia)

test by:

1. menase response (tests II, VII) (if w/ air, also testing V)

2. have pt. follow object

3. direct and consensual light reflexes

Front 19

CN III: nerve travels through...

Back 19

orbital fissure reach extrinsic and intrinsic musculature of the eye

Front 20

CN III: provides GSE to 5 skeletal mm.; dysfunction causes?

Back 20

medial rectus, ventral rectus, dorsal rectus, ventral oblique and levator palpebra superioris mm.

-lateral strabismus due to pull of lateral rectus m. (deviation that cant be overcome)

-ptosis (drooping of superior palpebra)

Front 21

CN III: provides GVE to __________ via what?

Back 21

sphincter pupillae m., cilliary mm.

via the ciliary ganglion and short ciliary nn.

Front 22

CN III: dysfunction of GVE causes what? tests?

Back 22

-mydriasis (dilation of the pupil)

-cycloplegia (paralysis of accommodation)

-test via direct and consensual light reflexes

Front 23

CN IV: responsible for?

Back 23

motor to dorsal oblique m. of the eye (GSE)

Front 24

CN IV: courses through? whats special?

Back 24

orbital fissure to reach the dorsal oblique m.; its the only CN to exit dorsal surface of the brain stem

Front 25

CN IV: dysfunction causes?

Back 25

eye rotates on anterior/posterior axis so that ventral part moves medially

Front 26

CN VI: responsible for?

Back 26

motor to lateral rectus and retractor bulbi mm. (GSE)

Front 27

CN VI: nerves course...

Back 27

through the orbital fissure to reach the extrinsic ocular skeltal m.

Front 28

CN VI: dysfunction causes?

Back 28

medial strabismus due to pull of the medial rectus m.