Cranial nerves

Question 1

What are Cranial nerves?

Answer 1

They provide sensory and motor innervation to the head and neck

They have both sensory and motor components as a group.

Individually they may be completely sensory or motor, or mixed

Question 2

What are the sensory inputs to the brain?

Answer 2

somatic = external surface of body

visceral = organs

special sensory = taste, smell, vision, hearing, balance

Question 3

What are the efferent outputs to the brain?

Answer 3

somatomotor = moving muscles

visceral motor = moving organs

Question 4

What are Cranial Ganglia?

Answer 4

Are cranial nerves that convey preganglionic parasympathetic fibers to specific ganglia

Question 5

What cranial nerves make up the Cranial Ganglia?

Answer 5

CN III

CN VII

CN IX

CN X

Question 6

What is cranial nerve I?

Answer 6

Olfactory

Question 7

What is Cranial Nerve II?

Answer 7

Optic

Question 8

What is Cranial Nerve III?

Answer 8

Oculomotor

Question 9

What is Cranial Nerve IV?

Answer 9

Trochlear

Question 10

What is Cranial Nerve V?

Answer 10

Trigeminal

Question 11

What is Cranial Nerve VI?

Answer 11

Abducens

Question 12

What is Cranial Nerve VII?

Answer 12

Facial

Question 13

What is Cranial Nerve VIII?

Answer 13

Vestibulocochlear

Question 14

What is Cranial Nerve IX?

Answer 14

Glossopharyngeal

Question 15

What is Cranial Nerve X?

Answer 15

Vagus

Question 16

What is Cranial Nerve XI?

Answer 16

Accessory

Question 17

What is Cranial Nerve XII

Answer 17

Hypoglossal

Question 18

What Cranial Nerves are Sensory?

Answer 18

Cranial Nerves: I, II, VIII

Question 19

What Cranial Nerves are Motor?

Answer 19

Cranial Nerves: III, IV, VI, XI, XII

Question 20

What Cranial Nerves are both Sensory and Motor?

Answer 20

Cranial Nerves: V, VII, IX, X

Question 21

What does Cranial Nerve I do?

Answer 21

Special sense = involved in smelling

Question 22

What does Cranial Nerve II do?

Answer 22

The optic nerve carries special sensory afferent fibers used to provide vision.

Question 23

What does Cranial Nerve III do?

Answer 23

The oculomotor nerve has General Somatic Efferent to innervate: inferior oblique, inferior-superior-medial rectus. It also has General Visceral Efferent to innervate: sphincter pupillae muscle (parasympathetics)

Question 24

What does Cranial Nerve IV do?

Answer 24

The trochlear nerve has General Somatic Efferent and innervates the superior oblique muscle.

Question 25

What does Cranial Nerve V do?

Answer 25

The Trigeminal nerve is the main sensory innervatio to the head. * contains GSA fibers for sensory information of the head * has Bronchial Efferent fibers to give motor innervation to muscles of mastication

Question 26

What are the **three** divisions of the Trigeminal nerve?

Answer 26

1. Opthalmic (V₁) 2. Maxillary (V₂) 3. Mandibular (V₃)

Question 27

What does Cranial Nerve VI do?

Answer 27

The Abducens nerve carries GSE fibers to the lateral rectus muscle.

Question 28

What does Cranial Nerve VII do?

Answer 28

The Facial Nerve has 1. Bronchial efferent fibers that innervate muscles of facial expression. 2. Special Sensory afferent - provides taste from the anterior 2/3 of the tongue. 3. GSA for sensation to small portion of skin around ear.

Question 29

What 2 nerves go out throught the internal acoustic meatus?

Answer 29

1. Vestibulocochlear Nerve 2. Facial Nerve

Question 30

What does Cranial Nerve IX do?

Answer 30

The Glossopharyngeal nerve carries: 1. General Somatic Afferent for the posterior 1/3 of the tongue 2. General Visceral fibers for the carotid body and carotid sinus, the pharynx 3. Bronchial Efferent to innervate the stylopharyngeal muscle 4. Special Sensory for taste sensation of posterior 1/3 of the tongue.

Question 31

What does Cranial Nerve X do?

Answer 31

The Vagus nerve: 1. General Somatic Afferent: for skin sensation behind ear and dura mater 2. General Visceral Afferent: sensory for the carotid body (chemoreceptors) and baroreceptors for the aortic arch 3. General Visceral Efferent: parasympathetic of ANS to stimulate glands in pharynx, larynx 4. Branchial Efferent: innervate muscles in the pharynx and larynx

Question 32

What does Cranial Nerve XI?

Answer 32

Accessory Nerve has only ## Footnote Bronchial efferent fibers: innervate the trapezius and sternocleidomastoid

Question 33

What does Cranial Nerve XII do?

Answer 33

Hypoglossus Nerve has ## Footnote General Somatic Efferent fibers: innervate the intrinsic muscles of the tongue and the extrinsic except for palatoglossus

Question 34

Where does the Hypoglossus exit the skull?

Answer 34

the hypoglossal canal in the occipital bone.

Question 35

Where does the optic nerve exit the skull?

Answer 35

the optic canal on the sphenoid bone

Question 36

where does the oculomotor nerve exit the skull?

Answer 36

travels through the cavernous sinus and exits through superior orbital fissure in the sphenoid bone.

Question 37

How does the trochlear nerve exit the skull?

Answer 37

through the superior orbital fissure in the sphenoid bone.

Question 38

how does the abducens exit the skull?

Answer 38

throught the superior orbital fissure in the sphenoid bone.