Cranial Nerves

Question 1

Cranial Nerves

Answer 1

Provide sensory and motor info for oral, pharyngeal, and laryngeal muscles

Part of PNS
CN nuclei embedded in the structures of the brain, motor receives impulses via the corticonuclear tracts

Corticonuclear fibers decussate before synapsids with motor CN nuclei

Most have bilateral intervention!

Question 2

I

Answer 2

Olfactory
Sensory
Smell
Does NOT synapse with the brainstem

Question 3

II

Answer 3

Optic
Sensory
Vision
Does not synapse with brainstem (except for visual reflexes)

Question 4

III

Answer 4

Occulomotor
Motor
Eye movement

Question 5

IV

Answer 5

Trochlear
Motor
Superior and oblique eye movement

Question 6

V

Answer 6

Trigeminal
Both (primarily sensory)
F:
3 branches:
Maxillary (S)
Mandibular (S+M)
Opthalamic (S)

Question 7

VI

Answer 7

Abducens
Motor
Lateral eye movement

Question 8

VII

Answer 8

Facial
Both (primarily motor)
Moves lips, cheek, eyebrows, nose
Sense taste (anterior 2/3)
5 branches:
T
Z
B
M
C

Question 9

VIII

Answer 9

Vestibulocochlear
Sensory
Hearing and balance

Question 10

IX

Answer 10

Glossopharyngeal
Both
Sensory - posterior 1/3 tongue
Motor - peristalsis, pharyngeal constrictors

Question 11

X

Answer 11

Vagus
Both
Pharyngeal & laryngeal branches
Innervated tongue, soft palate, pharynx, larynx
\+ viscera, glands, digestion, heart rate

Question 12

XI

Answer 12

Accessory
Motor
Redundantly innervated vagus areas
Sternocleidomastoid + trapezius

Question 13

XII

Answer 13

Hypoglosasal
Motor
Muscles in tongue (all intrinsic, most extrinsic - except palatoglossus)