Cranial Nerves I

Question 1

They give rise to the structures of the head and neck.

Answer 1

The branchial arches aka pharyngeal arches

Question 2

Define the branchial arches

Answer 2

Series of extremely visible anterior tissue bands that lie under the early brain in embryologic development.

Question 3

How many arches form during development of a human and how many of those are visible on the embryo?

Answer 3

5; 4

Question 4

What to do brachial arches give rise to?

Answer 4

• Face
• Tongue
• Lips
• Jaws
• Palate
• Pharynx
• Neck CNs
• Glands

Question 5

CN V name and artery

Answer 5

Trigeminal, maxillary artery

Question 6

Trigeminal artery skeletal structures:

Answer 6

Mandible, maxilla, malleus, incus.

Question 7

CN V muscles:

Answer 7

Muscles of mastication, mylohyoid, anterior belly of digasteric.

Question 8

Facial nerve number and artery:

Answer 8

CN VII, Stapedial artery.

Question 9

These skeletal structures are innervated by the facial nerve:

Answer 9

Stapes, styloid process, upper part of body of hyoid.

Question 10

Facial nerve (VII) muscles:

Answer 10

Muscles of facial expression, stapedius, stylohyoid, posterior belly of digastric.

Question 11

Common carotid & internal carotid arteries feed this CN:

Answer 11

Glossopharyngeal (IX)

Question 12

CN IX skeletal structures:

Answer 12

Lower part of body of hyoid.

Question 13

CN IX name:

Answer 13

Glossopharyngeal

Question 14

Vagus (X) nerve arteries:

Answer 14

Part of aortic arch and part of R subclavian arteries.

Also part of the L and R pulmonary arteries.

Question 15

Thyroid and cricoid cartilages are the skeletal structures of the CN:

Answer 15

Vegus (X)

Question 16

CN II

Answer 16

Optic Nerve

Question 17

Optic Nerve is CN __

Answer 17

II

Question 18

Optic nerve is surrounded by

Answer 18

meninges and CSF

Question 19

The optic nerve exits the cranial cavity via the

Answer 19

optic canal

Question 20

The optic nerve is composed of what?

Answer 20

axons of ganglion cells that are located in the retina

Question 21

Nerves from the optic canal cross at the _____ which is located directly above the _____

Answer 21

Optic chiasm, pituitary gland

Question 22

Nasal retinal fibers will _________, while temporal retinal fibers will ______

Answer 22

cross into the opposite optic tract, remain uncrossed

Question 23

(Ant/Post) to the chiasm, the continuation of the visual signal occurs via the ______, which relay information to the _______ and ultimately the ______

Answer 23

optic tracts, lateral geniculate nucleus (LGN), visual cortex

Question 24

The optic nerve contains these kinds of fibers

Answer 24

Special Afferent (SA) fibers for vision

Question 25

The optic nerve is surrounded by what kind of nerves?

Answer 25

Ophthalmic nerves

Question 26

Optic nerve enters the globe from the _____ surface

Answer 26

Posterior

Question 27

CN III

Answer 27

Oculomotor

Question 28

Oculomotor CN ___

Answer 28

III

Question 29

The nuclei of Oculomotor nerve are located where?

Answer 29

in the midbrain

Question 30

Oculomotor nerve contains what type of nerves?

Answer 30

Motor GE and parasympathetic fibers (VE)

Question 31

The oculomotor nerve exits the cranial cavity through through

Answer 31

the superior orbital fissure

Question 32

_______ of the provide motor innervation to extraocular muscles

Answer 32

General Efferent (GE)

Question 33

Name the muscles that are innervated by general efferent fibers of oculomotor nerves

Answer 33

Superior rectus, inferior rectus, medial rectus, inferior oblique, levator palpebrae superioris

Question 34

______ fibers provide innervation to smooth muscles of the eye

Answer 34

Visceral Efferent (VE)

Question 35

Visceral efferent fibers of the oculomotor nerve are (sympathetic/parasympathetic)

Answer 35

parasympathetic

Question 36

Superior rectus, inferior rectus, medial rectus, inferior oblique, levator palpebrae superioris are innervated by what type of fibers?

Answer 36

General efferent

Question 37

Iris sphincter, ciliary muscles are innervated by what kind of fibers?

Answer 37

Visceral Efferent

Question 38

Name the muscles innervated by the oculomotor nerve

Answer 38

Superior, inferior, medial rectus | Inferior oblique and levator palpebrae superioris, irsi sphincter and ciliary muscle

Question 39

Trauma to this region can affect your sense of smell

Answer 39

cribriform plate

Question 40

Fracture of the cribriform plate can also lead to

Answer 40

cerebrospinal fluid rhinorrhea (its like diarrhea of csf through the nose)

Question 41

Which nerve is not a true nerve?

Answer 41

Olfactory nerve (CN I)

Question 42

CN I is surrounded by

Answer 42

CSF and meninges

Question 43

CN I exits the cranial cavity through

Answer 43

perforations in the cribriform plate of the ethmoid bone

Question 44

CN I contains what kind of fibers?

Answer 44

Special afferent (SA) fibers

Question 45

Anosmia is

Answer 45

absent olfaction