Peripheral nervous system: 12 Cranial nerves

Question 1

CN I - Olfactory

Answer 1

Olfactory
function - sensory: smell

Question 2

CN II - Optic

Answer 2

Optic
function - sensory: sight

Question 3

CN III - Oculomotor

Answer 3

Oculomotor
Function:
-Somatic Motor: Superior, Medial, Inferior Rectus, Inferior Oblique
-Visceral Motor: Sphincter Pupillae

Question 4

CN IV - Trochlear Superior

Answer 4

Trochlear Superior
Function:
-Somatic Motor: Superior Oblique

Question 5

CN V - Trigeminal

Answer 5

Trigeminal
Function:
-Somatic Sensory: Face
-Somatic Motor: Mastication, Tensor Tympani, Tensor Palati

Question 6

CN VI - Abducens

Answer 6

Abducens
Function:
-Somatic Motor: Lateral Rectus

Question 7

CN VII - Facial

Answer 7

Facial
Function:
-Somatic sensory: Posterior External Ear Canal
-Special Sensory: Taste (Anterior 2/3 Tongue)
-Somatic Motor: Muscles Of Facial Expression
-Visceral Motor: Salivary Glands, Lacrimal Glands

Question 8

CN VIII - VestibuloCochlear

Answer 8

VestibuloCochlear
Funtion:
-Special Sensory: Auditory/Balance

Question 9

CN IX - Glossopharyngeal

Answer 9

Glossopharyngeal
Function:
-Somatic Sensory: Posterior 1/3 Tongue, Middle Ear
-Visceral Sensory: Carotid Body/Sinus
-Special Sensory: Taste (Posterior 1/3 Tongue)
-Somatic Motor: Stylopharyngeus
-Visceral Motor: Parotid Gland

Question 10

CN X - Vagus

Answer 10

Vagus
Function:
-Somatic Sensory: External Ear
-Visceral Sensory: Aortic Arch/Body
-Special sensory: Taste Over Epiglottis
-Somatic Motor: Soft Palate, Pharynx, Larynx (Vocalization and Swallowing)
-Visceral Motor: Bronchoconstriction, Peristalsis, Bradycardia, Vomitting

Question 11

CN XI - Spinal accessory

Answer 11

Spinal Accessory
Function:
-Somatic Motor: Trapezius, Sternocleidomastoid

Question 12

CN XII - Hypoglossal

Answer 12

Hypoglossal
Function:
-Somatic Motor: Tongue

Question 13

More about the peripheral nervous system

Answer 13

• 31 pairs of spinal nerves
• autonomic nervous system - controls many organs/glands/smooth muscles. ANS works without us knowing
• ANS - regulates homeostasis and the ability to override it in mergency situations

Question 14

ANS breakdowns into:

Answer 14

Sympathetic nervous system - fight or flight

parasympathetic nervous system - rest and digest