Head And Neck Cranial Nerves I-Iv, Vi

Front 1

CN I Name?
Function?

Back 1

Sense of smell

Front 2

CN I Origin?

Back 2

Bipolar cells of upper nasal mucosa

Front 3

CN I Passage?

Back 3

Cribiform Plate of ethmoid bone

Front 4

CN I Termination?

Back 4

Olfactory bulb

Front 5

CN I What type of nerve?

Back 5

SVA, SSA(?)

Front 6

CN II What type of nerve?

Back 6

SSA

Front 7

CN II Name?
Function?

Back 7

Optic
Vision and pupillary light reflex (with CN III)
Innervates the retina

Front 8

CN II Origin?

Back 8

Retinal ganglion cells

Front 9

CN II Passage?

Back 9

Optic foramen/canal (sphenoid) -> optic chiasm -> optic tracts

Front 10

CN II Termination?

Back 10

Geniculate nuclei in thalamus

Front 11

CN II
Which fibers decussate?
Which fibers remain ipsilateral?

Back 11

Nasal side fibers decussate and go with contralateral optic tract.

Temporal side fibers remain ipsilateral.

Front 12

CN III Name?
Function?

Back 12

Oculomotor
Controls most extraocular muscles, the levator palpebrae superioris & carries parasympathetic and sympathetic control to the pupil.

Front 13

CN III What type of nerve?

Back 13

GSE, GVE & GSA

Front 14

CN III Origin? GSE & GVE

Back 14

GSE -> Oculomotor nucleus in midbrain

GVE -> Edinger-Westphal nucleus

Front 15

CN III Pathway?

Back 15

Superior Orbital Fissure

Front 16

CN III Termination?
GSE & GVE?

Back 16

GSE -> Innervation of Medial Rectus, Superior Rectus, Inferior Rectus & Inferior Oblique

GVE -> Sphincter pupillae & ciliary muscles

Front 17

Medial Rectus moves eye how?
What CN?

Back 17

Adduction (towards midline)
CN III

Front 18

Superior Rectus moves eye how?
What CN?

Back 18

Elevation
CN III

Front 19

Inferior Rectus moves eye how?
What CN?

Back 19

Depression
CN III

Front 20

Inferior Oblique moves eye how?
What CN?

Back 20

Elevation and adduction
CN III

Front 21

Superior Oblique moves eye how?
What CN?

Back 21

Depression and abduction.
CN IV

Front 22

Lateral Rectus moves eye how?
What CN?

Back 22

Abduction.
CN VI

Front 23

CN IV Name?
Function?

Back 23

Trochlear
Turns eye down and laterally out.

Front 24

CN IV Origin?

Back 24

Trochlear Nucleus

Front 25

CN IV Pathway?

Back 25

Superior Orbital Fissure.

Front 26

CN IV Termination?

Back 26

Superior Oblique Muscle of the eye.

Front 27

What is the only cranial nerve to exit from the brainstem's posterior?

Back 27

CN IV
Trochlear

Front 28

CN VI Name?
Function?

Back 28

Abducens
Turns eye laterally

Front 29

CN IV What type of nerve?

Back 29

GSE, GSA*

Front 30

CN VI Origin?

Back 30

Abducens nucleus in the pons

Front 31

CN VI Pathway?

Back 31

Superior Orbital Fissure.

Front 32

CN VI Termination?

Back 32

Lateral Rectus Muscle

Front 33

CN VI What type of nerve is it?

Back 33

GSE, GSA*

Front 34

All of the following muscles are innervated by cranial nerves with SVE components except?
a. temporalis
b. orbicularis oris
c. platysma
d. medial pterygoid
e. lateral rectus

Back 34

e. lateral rectus

Front 35

The only cranial nerve which arises from the posterior surface of the brainstem?
a. occulomotor
b. trochlear
c. trigeminal
d. abducent
e. facial

Back 35

b. trochlear

Front 36

After a hard blow to the face a patient was left with a black eye on the right and inability to look downward with the right eye. An x-ray reveals a compound fracture on the right orbital floor. Which muscle may be trapped when the patient tries to look downward?
a. inferior oblique
b. inferior rectus
c. medial rectus
d. lateral rectus
e. levetor palpebre

Back 36

b. inferior rectus

Front 37

Which of the following structues does not pass through the superior orbital fissure?
a. opthalmic branch of trigeminal
b. abducent nerve
c. occulomotor nerve
d. opthalamic vein
e. opthalamic artery

Back 37

e. opthalamic artery (optic canal)

Front 38

The ciliary muscles of the eye are innervated by which cranial nerve?

Back 38

III

Front 39

The muscle which is primarily responsible for abduction of the globe of the eye?
a. Lateral rectus
b. Medial rectus
c. Superior oblique
d. Levator palpebre

Back 39

a. lateral rectus

Front 40

What specific type of nerves innervate the dilator papillae muscle of the iris of the eye?

Back 40

Sympathetic post-ganglionic

Front 41

Which of the following muscles are innervated by the oculomotor nerve?
One-Levator palpebrae superioris
Two-Lateral rectus
Three-Inferior Oblique
Four-Superior Oblique
a. 1, 2, & 3
b. 1 & 3
c. 2 & 4
d. 4 only

Back 41

b. 1 & 3

Front 42

Sympathetic post-ganglionic fibers innervate which orbital muscles?
One-Levator palpebrae superioris
Two-Constrictor papillae
Three-Dilator papillae
Four-Ciliary muscles of the lens of the eye

a. 1, 2 & 3
b. 1 & 3
c. 2 & 4
d. 4 only

Back 42

b. 1 & 3

Front 43

Which extraocular muscle abducts the globe of the eye?
a. Superior oblique
b. Medial rectus
c. Lateral rectus
d. Inferior oblique

Back 43

c. lateral rectus

Front 44

The aleque nasi is a portion of which muscle?
a. Orbiularis occuli
b. Levator anguli oris
c. Levator labii superioris
d. The orbicularis oris

Back 44

c. levator labii

Front 45

Sympathetic post-ganglionic fibers innervate which muscles of the eye?
a. Constrictor papillae
b. Levator palpebrae superioris
c. Ciliary muscles of the lens of the eye
d. Dilator papillae
i. A, b & c
ii. A & c
iii. B & d
iv. D only

Back 45

iii. b & d

Front 46

The extraocular muscle which moves the visual axis laterally?
a. Superior rectus
b. Medial rectus
c. Lateral rectus
d. Inferior rectus

Back 46

c. lateral rectus