Skull and Cranial Nerves

Question 1

CN I

Answer 1

Olfactory Nerve

Question 2

CN II

Answer 2

Optic Nerve

Question 3

CN III

Answer 3

Oculomotor Nerve

Question 4

CN IV

Answer 4

Trochlear Nerve

Question 5

CN V

Answer 5

Trigeminal Nerve

Question 6

CN VI

Answer 6

Abduncens (think of 6 pack abs)

Question 7

CN VII

Answer 7

Facial Nerve

Question 8

CN VIII

Answer 8

Vestibulocochlear Nerve

Question 9

CN IX

Answer 9

Glossopharyngeal Nerve

Question 10

CN X

Answer 10

Vagus Nerve

Question 11

CN XI

Answer 11

Spinal Accessory Nerve

Question 12

CN XII

Answer 12

Hypoglossal Nerve

Question 13

CN I (Olfactory Nerve)

Answer 13

Sensory Nerve

Cranial Exit:
Foramina in Cribiform Plate of Ethmoid bone

Action:
Smell

Question 14

CN II (Optic Nerve)

Answer 14

Sensory Nerve

Cranial Exit:
Optic Canal

Action:
Vision from Retina

Question 15

CN III (Oculomotor)

Answer 15

Visceral Motor/Somatic Motor

Cranial Exit:
Superior Orbital Fissure

Action:
Motor to superior rectus, inferior rectus, medial rectus, Inferior oblique, and levator palpebrae; raises superior eyelid; turns eyeball superiorly, inferiorly, and medially

Question 16

CN IV (Trochlear Nerve)

Answer 16

Somatic Motor

Cranial Exit:
Superior Orbital Fissure

Action:
Motor to Superior Oblique to assist in turning eye inferolaterally (or inferiorly when adducted).

Question 17

CN V1 (Trigeminal Nerve)

Answer 17

Ophthalmic Nerve- Somatic Sensory Nerve

Cranial Exit:
Superior Orbital Fissure

Action:
Sensation from Sinus
OR cornea, skin of forehead, scalp, eyelids, nose and mucosa of nasal cavity and paranasal sinuses.

Question 18

CN V2 (Trigeminal Nerve)

Answer 18

Maxillary Nerve- Somatic Sensory Nerve

Cranial Exit:
Foramen Rotundum

Action:
Sensation from Face
OR skin of face over maxilla, including upper lip, maxillary teeth, mucosa of nose, maxillary sinuses and palate.

Question 19

CN V3 (Trigeminal Nerve)

Answer 19

Mandibular Nerve- Somatic Motor/Somatic Sensory

Cranial Exit:
Foramen Ovale

Action:
Motor to muscles of Mastication, mylohyoid,
anterior belly of digastric, tensor veli palatini, and tensor
tympani.

Question 20

CN VI (Abducent Nerve)

Answer 20

Somatic Motor

Cranial Exit:
Superior Orbital fissure

Action:
Motor to lateral rectus to turn eye laterally

Question 21

CN VII (Facial Nerve)

Answer 21

Both Sensory/Motor

Cranial Exit:
Internal Acoustic Meatus; Facial canal; Stylomastoid foramen

Action:

Motor- Parasympathetic to submandibular and sublingual
salivary glands, lacrimal gland, and glands to nose and
palate.
Motor to muscles of facial expression and scalp, also
stapedius of middle ear, stylohyoid, posterior belly of
digastric

Sensory- Sensation from skin of external acoustic meatus
Taste from anterior two thirds of tongue and palate

Question 22

CN VIII (Vestibulocochlear)

Answer 22

Sensory Nerve

Cranial Exit:
Internal Acoustic Meatus

Action:
Vestibular- Orientation/Movement
Cochlear- Hearing

Question 23

CN IX (Glossopharyngeal)

Answer 23

Both Sensory/Motor

Cranial Exit:
Jugular Foramen

Action:
Motor to sylopharyngeus to parotid gland (somatic motor)
Parasympathetic innervation to parotid gland (Visceral motor)
Taste from posterior third of tongue (Special sensory)
External ear, pharynx, middle ear (Somatic sensory)
Carotid body and sinus (Visceral sensory)

Question 24

CN X (Vagus Nerve)

Answer 24

Both Sensory/Motor

Cranial Exit:
Jugular Foramen

Action:

Motor:
Parasympathetic to smooth muscle of trachea, bronchi,
digestive tract, cardiac muscle Motor to constrictors of pharynx, intrinsics of larynx,
muscles of palate, muscles in upper 2/3rds of esophagus

Sensory:
Sensation from auricle, external acoustic meatus, and dura
of posterior cranial fossa
Sensation from base of tongue, pharynx, larynx, trachea,
bronchi, heart, esophagus, stomach, and intestine
Taste from epiglottis and palate

Question 25

CN XI (Spinal Accessory Nerve)

Answer 25

Somatic Motor

Cranial Exit:
Jugular Foramen

Action:
Motor to SCM and Trapezius

Question 26

CN XII (Hypoglossal Nerve)

Answer 26

Somatic Motor

Cranial Exit:
Hypoglossal Canal

Action:
Motor to intrinsic and extrinsic muscles of tongue (except palatoglossus)