Cranial Nerves

Question 1

Cranial Nerves exit from here

Answer 1

Forebrain CN 1
Thalamus CN 2
Brainstem CN 3-12

Question 2

Formation of cranial nerves

Answer 2

Dorsal (sensory)
Ventral (motor)

-Sides of neural tube get pushed outward to make a roof plate, which contains the 4th ventricle

Question 3

Sulcus limitans separates these regions

Answer 3

Ventral from dorsal

Question 4

General Somatic Afferent

Answer 4

Skin, muscle, CT

Question 5

Ceneral Visceral Afferent

Answer 5

Organs, blood, vessels

Question 6

Special Somatic Afferent

Answer 6

Vision, audition

Question 7

Special Visceral Afferent

Answer 7

Taste, olfaction

Question 8

General Somatic Efferent

Answer 8

Skeletal muscle

Question 9

General Visceral Efferent

Answer 9

Smooth and cardiac muscle (ANS)

Question 10

Special Somatic Efferent

Answer 10

None

Question 11

Special Visceral Efferent

Answer 11

Muscles of face, larynx, pharynx, mastication

Question 12

Cranial nerve nuclei are arranged this way

Answer 12

Longitudinally

Question 13

Solitary nucleus (SVA) receives taste from

Answer 13

VII, IX, X

Question 14

Nucleus ambiguus (SCE) projects neurons out along

Answer 14

IX, X

Question 15

Special visceral efferent is associated with this and develops from this

Answer 15

pharyngeal, neural crest

Question 16

CN I test Olfactory

Answer 16

odor

Question 17

CN II test Optic

Answer 17

visual acuity and fields, opthalmoscopy

Question 18

CN III test Oculomotor

Answer 18

PERRLA (pupils equal, round, reactive to light, accomidation)- equal ocular motion while following finger

Question 19

CN IV test Trochlear

Answer 19

moving eyes side to side- equal ocular motion while following finger

Question 20

CN VI test Abducens

Answer 20

equal ocular motion while following finger

Question 21

CN V test Trigeminal

Answer 21

sensory to face, motor to masticators and other muscles

Corneal blink- corneal pain and irritation- elicits eye closure

Question 22

Trigeminal’s 4 functional Components

Answer 22

Principal sensory nucleus- touch to face
Spinal Trigeminal nucleus- pain and temp
…
…

Question 23

CN VII test Facial

Answer 23

Facial expression, salivation, taste, somatosensory input from ear
-Smile, frown, wrinkle brow, wink

Question 24

CN VIII test Vestibulocochlear

Answer 24

rubbing fingers, humming, tuning fork

Question 25

CN IX test Glossopharyngeal

Answer 25

gag reflex– sensory component of IX to X reflex connection

Question 26

CN X test Vagus

Answer 26

Gage reflex, raise tongue to rough of mouth, check for deviated soft palate

Question 27

CN XI test Accessory

Answer 27

Shrug shoulder, persist pressure on forehead, chin

Question 28

CN XII test Hypoglossal

Answer 28

stick tongue out

Question 29

Know functions of all CN

Answer 29

Yep