Cranial Nerves

Question 1

Olfactory (function)

Answer 1

Sensory

Question 2

Optic (function)

Answer 2

Sensory

Question 3

Oculomotor (function)

Answer 3

Motor

Question 4

Trochlear (function)

Answer 4

Motor

Question 5

Trigeminal (function)

Answer 5

Both

Question 6

Abducens (function)

Answer 6

Motor

Question 7

Facial (function)

Answer 7

Both

Question 8

Auditory/Vestibulocochlear (function)

Answer 8

Sensory

Question 9

Glossopharyngeal (function)

Answer 9

Both

Question 10

Vagus (function)

Answer 10

Both

Question 11

Accessory/Spinal (function)

Answer 11

Motor

Question 12

Hypoglossal (function)

Answer 12

Motor

Question 13

Terminal (function)

Answer 13

Sensory

Question 14

Vomeronasal (function)

Answer 14

Sensory

Question 15

Epiphyseal (function)

Answer 15

Sensory

Question 16

Anterior Lateral Line (function)

Answer 16

Sensory

Question 17

Posterior Lateral Line (function)

Answer 17

Sensory

Question 18

I

Answer 18

Olfactory

Question 19

II

Answer 19

Optic

Question 20

III

Answer 20

Oculomotor

Question 21

IV

Answer 21

Trochlear

Question 22

V

Answer 22

Trigeminal

Question 23

VI

Answer 23

Abducens

Question 24

VII

Answer 24

Facial

Question 25

VIII

Answer 25

Auditory/Vestibulocochlear

Question 26

IX

Answer 26

Glossopharyngeal

Question 27

X

Answer 27

Vagus

Question 28

XI

Answer 28

Accessory/Spinal

Question 29

XII

Answer 29

Hypoglossal

Question 30

0

Answer 30

Terminal

Question 31

VN

Answer 31

Vomeronasal

Question 32

E

Answer 32

Epiphyseal

Question 33

P

Answer 33

Profundus

Question 34

ALL

Answer 34

Anterior Lateral Line

Question 35

PLL

Answer 35

Posterior Lateral Line

Question 36

• smell info from nose
• cell bodies: olfactory epithelium → olfactory bulb
• in mammals: travels through cribiform plate of the ethmoid bone via foramina

Answer 36

Olfactory

Question 37

• visual info from eyes

Answer 37

Optic

Question 38

• movement of eyeball & pupil reflex

Answer 38

Oculomotor

Question 39

• movement of eyeball
• arises dorsally from the brain
• smallest cranial nerve along w/ VI-Abducens

Answer 39

Trochlear

Question 40

• 3 branches:
  1) Ophthalmic - in agnathans, osteichthyans, tetrapods; primitively a separate Profundus nerve
  2) Maxillary - “infraorbital” in fishes
  3) Mandibular - has the only motor fibers in this nerve; control jaw muscles & tensor tympani
• all branches contain sensory fibers: info from skin of the head & other structures in the mouth & nose

Answer 40

Trigeminal

Question 41

• movement of eyeball
• arises at anterior end of hindbrain
• smalles cranial nerve along w/ IV - Trochlear

Answer 41

Abducens

Question 42

• arises from anterior end of hindbrain
• Sensory Function:
  1) in fish: taste buds in ectoderm, general sensation from endoderm of 2nd arch
  2) in tetrapods: taste buds on anterior of tongue
• Motor Function:
  1) innervates muscles of hyoid arch (facial & stapedius)
  2) innervates some endocrine glands via autonomic ganglia

Answer 42

Facial

Question 43

• auditory & equilibriatory info from membranous labyrinth
• arises from medulla oblongata
• 2 branches:
  1) cochlear → cochlea
  2) vestibular nerve → semicircular canals

Answer 43

Auditory/Vestibulocochlear

Question 44

• arises from medulla oblongata
• Motor Function:
  1) muscles derived from 3rd arch
  2) parotid salivary gland via otic ganglion
• Sensory Function:
  1) in fishes: lateral line canals
  2) in tetrapods: proprioreceptors in the innervated muscles
  3) in mammals: taste buds & general receptors on posterior surface of the tongue

Answer 44

Glossopharyngeal

Question 45

• arises from medulla oblongata
• Sensory Function:
  1) posterior walls of some gills & demibranchs
  2) sensation & taste on a portion of the palate
  3) sensation of coelomic viscera
• Motor Function:
  1) pharyngeal arches (chief respiratory nerves in fish)
  2) movement of smooth muscles in the coelomic viscera

Answer 45

Vagus

Question 46

1) internal ramus
- joins Vagus to autonomic ganglia in the coelom
2) external ramus
- emerge from the spinal cord & eventually innervate the neck muscles

Answer 46

Accessory/Spinal

Question 47

• arises from hypoglossal nucleus
• innervates tongue muscles & geniohyoid
• a spinal nerve “locked up” in the braincase due to the location of the foramen magnum

Answer 47

Hypoglossal

Question 48

• play a role in reproductive behaviors
• lies close to olfactory bulb & tract
• in humans, rarely seen in dissections

Answer 48

Terminal

Question 49

• smell info from vomeronasal organ
• terminate in an accessory olfactory bulb
• only in some reptiles

Answer 49

Vomeronasal

Question 50

• light info from pineal & parapineal (when these are photoreceptors such as in lampreys & lizards)

Answer 50

Epiphyseal

Question 51

• maybe fused with Trigeminal

Answer 51

Profundus

Question 52

• mechanoreceptive info from lateral lines

- actually 3 nerves

Answer 52

Anterior & Posterior Lateral Line