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Flashcards in Cranial Nerves Deck (27)
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1

Cranial nerves originate from the?

Brain nuclei and innervate structures of the head and neck

2

The vagus nerve innervates

structures in the lower body as well as the structures of the head and neck

3

How many pairs of cranial nerves do mammals have?

12 pair

4

____ of the cranial nerves are mixed nerves

four

5

Eight cranial nerves have been designated as being either ____ or ____ based on the MAJORITY of the neuron fiber type that comprises them

sensory or motor

6

Afferent

sensory

7

Efferent

motor

8

Sensory neurons

receptors

9

Somatic motor neuron

skeletal muscles

10

Autonomic motor neurons

smooth muscle, cardiac muscle, glands

11

Efferent (motor) neuron cell bodies are located

within specific brain nuclei

12

Post-Synaptic autonomic neuron cell bodies are located

within autonomic (PSNS) ganglia

13

Parasympathetic ganglia of the head include ganglia of

CN III, VII, & IX

14

Afferent (sensory) neuron cell bodies are located

within specific cranial ganglia

15

Nerves of the head

Olfactory (I) S
Optic (II) S
Oculomotor (III) M
Trochlear (IV) M
Trigeminal (V) B
Abducens (VI) M
Facial (VII) B
Vestibulocochlear (VIII) S
Glossopharyngeal (IX) B
Vagus (X) B
Accessory (XI) M
Hypoglossal (XII) M

16

Sensory fibers of CN I transmit impulses associated with the sense of

smell, including pheromone perception from the vomeronasal organ

17

Olfactory epithelium covers the rostral surface of the

cribriform plate of the ethmoid bone

18

Olfactory receptor cells are _____ neurons whose cell bodies are located within the ______

bipolar, olfactory epithelium

19

Cilia of the dendrites of olfactory receptor cells bind

odorant molecules

20

Collective axons of these bipolar neurons pass through the foramina of the cribiform plate of the ethmoid bone as the

olfactory nerves

21

The axons of these neurons (olfactory receptor cells) synapse on neurons within the

olfactory bulbs

22

Sensory fibers of CNII transmit

visual impulses in response to light stimuli

23

Optic nerve comprised of the collective axonal processes of the

ganglion cells of the retina

24

The optic nerve begins at the ____ and passes through the ____

optic disk, optic canal

25

What nerves supply somatic motor innervation to the muscles of the eye

III, IV, VI

26

What does CN IV supply?

dorsal oblique m

27

What does CN VI supply?

lateral rectus & retractor bulbi m