Cranial And Spinal Nerves

Question 1

Cranial nerve I

Answer 1

Name: olfactory
Sensory (s)
Function: smell
If damaged: loss of smell

Question 2

Cranial nerve II

Answer 2

Name: optic
Sensory (s)
Function: vision
If damaged: vision in affected eye can be lost

Question 3

Cranial nerve III

Answer 3

Name: oculomotor
Motor (m)
Function: eye movement
If damaged: double vision, can’t move up and down, pupil may not respond right to light

Question 4

Cranial nerve IV

Answer 4

Name: Trochlear
motor (m)
Function: turns eye downwards, rotates eyeball towards nose
If damaged: double images, eye cannot turn down

Question 5

Cranial nerve V

Answer 5

Name: trigeminal
Sensory + motor (b)
Function: Sensory info from face
If damaged: trigeminal neuralgia

Question 6

Cranial nerve VI

Answer 6

Name: abducens
Motor (m)
Function: turns eye laterally
If damaged: affected eye cannot turn fully outward

Question 7

VII

Answer 7

Name: facial
Sensory + motor (b)
Function: motor nerve to facial muscles, taste from 2/3 tongue
If damaged: distorted appearance, problem closing eyes, chewing, taste, making expression, some numb areas

Question 8

Cranial nerve VIII

Answer 8

Name: Vestibulocochlear
Sensory (s)
Function: hearing, equilibrium
If damaged: deafness, ringing in ear, unsteady balance, vertigo +nausea

Question 9

Cranial nerve IX

Answer 9

Name: glossopharyngeal
Sensory + motor (b)
Function: taste from posterior 2/3 tongue, sensation in throat and outer ear
If damaged: loss of gag reflex, difficulty swallowing, loss of bitter and sour taste

Question 10

Cranial nerve X

Answer 10

Name: vagus
Sensory + motor (b)
Function: visceral sensations, major role in: cardiac, digestive and urinary systems
If damaged: difficulty swallowing, speaking, loss of gag reflex

Question 11

Cranial nerve XI

Answer 11

Name: accessory
Motor (m)
Function: swallowing, neck, shoulder muscles
If damaged: weakness in shoulder, asymmetry of shoulder and upper back, shoulder drooping

Question 12

Cranial nerve XII

Answer 12

Name: hypoglossal
Motor (m)
Function: controls tongue, movement for speech, food manipulation, swallowing
If damaged: impairs speech, swallowing

Question 13

C1-C5

Answer 13

Plexus: cervical
Area of body served: head, neck, shoulders,

Question 14

What happens if spinal cord above C3 is severed

Answer 14

Breathing stops

Question 15

C5-T1

Answer 15

Plexus: Brachial
Area of body served: chest, shoulders, arms and hands

Question 16

T12-L5

Answer 16

Plexus: Lumbar
Area of body served: back, abdomen, groin, thighs, knees, calves

Question 17

L4, L5, S1-S4

Answer 17

Plexus: sacral
Area of body served: pelvis, buttocks, genitals,thighs, calves, feet

Question 18

S4, S5, Co1

Answer 18

Plexus: Coccygeal
Area of body served: small region over the coccyx

Question 19

What do plexuses ensure?

Answer 19

That if a single spinal nerve gets damaged there will still be inner action to that area of the body

Question 20

Why don’t thoracic nerves participate in forming of plexuses?

Answer 20

Thoracic nerves give rise to intercostal nerves.
Controls: muscles, sensory info regarding skin, parietal pleura

Question 21

Answer 21

Abducens (CN VI)

Question 22

Answer 22

Facial CN VII

Question 23

Answer 23

Olfactory bulb

Question 24

Answer 24

Optic CN II