Cranial Nerves

Question 1

II

Answer 1

Optic nerve

Question 2

III

Answer 2

Oculomotor nerve

Question 3

IV

Answer 3

Trochlear nerve

Question 4

V

Answer 4

Trigeminal nerve

Question 5

VI

Answer 5

Abducens nerve

Question 6

VII

Answer 6

Facial nerve

Question 7

VIII

Answer 7

Vestibulocochlear nerve

Question 8

IX

Answer 8

Glossopharyngeal nerve

Question 9

X

Answer 9

Vagus nerve

Question 10

XI

Answer 10

Spinal Accessory nerve

Question 11

XII

Answer 11

Hypoglossal nerve

Question 12

Cribriform plate

Answer 12

CN I: Olfactory

Question 13

Optic canal

Answer 13

CN II: Optic

Question 14

Orbital fissure

Answer 14

CN III: Oculomotor

CN IV: Trochlear

Ophthalmic branch of CN V: Trigeminal

CN VI: Abducens

Question 15

Round foramen and rostral alar foramen

Answer 15

Maxillary branch of CN V: Trigeminal

Question 16

Oval foramen

Answer 16

Mandibular branch of CN V: Trigeminal

Question 17

Stylomastoid foramen and internal acoustic meatus

Answer 17

CN VII: Facial

Question 18

Internal acoustic meatus

Answer 18

CN VIII: Vestibulocochlear

Question 19

Jugular foramen and tympanoccipital fissure

Answer 19

CN IX: Glossopharyngeal

CN X: Vagus

CN XI: Spinal Accessory

Question 20

I

Answer 20

Olfactory nerve

Question 21

Hypoglossal canal

Answer 21

CN XII: Hypoglossal

Question 22

Tests for: Olfaction (smell test). Cotton ball with alcohol (not something so strong it stimulates CN V by irritating the nasal mucosa)

Answer 22

CN I: Olfactory

Question 23

Tests for: menace response, obstacle course, quietly roll ball across visual field, also pupillary light reflex, and tracking response.

Answer 23

CN II: Optic

• II (afferent) in VII (efferent) out in for menace response
• II in III out for pupillary light reflex

Question 24

Test for: dorsal, ventral or medial movement of the pupil (DVM), look for lateral strabismus in lesioned animal, droopy upper eyelid, pupillary light reflex, including the indirect response to light in the contralateral eye

Answer 24

CN III: Oculomotor

-II in III out for pupillary light reflex

Question 25

Tests for: oblique deviation of pupil in lesioned animal

Answer 25

CN IV: Trochlear -not obvious in species with round pupils

Question 26

Tests for: palpebral reflex, medial canthus

Answer 26

Ophthalmic branch of CN V -V in VII out

Question 27

Tests for: palpebral reflex, lateral canthus; sensation to upper lip or nasal mucosa

Answer 27

Maxillary branch of CN V

Question 28

Tests for: sensation to lower lip/jaw or auriculotemporal area, or look for neurogenic atrophy to muscles of mastication

Answer 28

Mandibular branch of CN V

Question 29

Tests for: lateral movement of the eye in the head (tracking), look for medial strabismus in a lesioned animal

Answer 29

CN VI: Abducens

Question 30

Test for: palpebral reflex-failure to close the palpebral fissure in lesioned animal. Effects seen on muscles of facial expression. Look for deviation of philtrum, droopy ear.

Answer 30

CN VII: Facial

Question 31

Test for: hearing, vestibular signs (nystagmus, head tilt, circling, balance problems)

Answer 31

CN VIII: Vestibulocochlear

Question 32

Test for: gag reflex, swallowing

Answer 32

CN IX: Glossopharyngeal

Question 33

Test for: gag reflex, and listen to heart and gut sounds (increase heart, decrease gut with lesion)

Answer 33

CN X: Vagus

Question 34

Test for: neurogenic atrophy of neck muscles in lesioned animal

Answer 34

CN XI: Spinal Accessory

Question 35

Test for: tongue tone, tongue neurogenic atrophy

Answer 35

CN XII: Hypoglossal

Question 36

Motor to extrinsic and intrinsic muscles of the tongue

Answer 36

CN XII

Question 37

Motor to trapezius, omotransversarius, sternocephalicus and cleidocephalicus. Also motor to larynx via recurrent laryngeal nerve.

Answer 37

CN XI

Question 38

Some motor to larynx, pharynx and esophagus. Sensory to ear canal and epiglottis. Parasympathetic to heart, lungs, and abdomen.

Answer 38

CN X

Question 39

Sensory for hearing and balance

Answer 39

CN VIII

Question 40

Sensory to caudal 1/3 of tongue (taste) and pharyngeal mucosa (touch). Motor to the pharynx. Parasympathetic to parotid and mucosal glands.

Answer 40

CN IX

Question 41

Motor to muscles of facial expression. Sensory to rostral 2/3 of tongue (taste). Parasympathetic to salivary and lacrimal glands.

Answer 41

CN VII

Question 42

Motor to retractor bulbi muscles and lateral rectus muscle.

Answer 42

CN VI

Question 43

Sensory from lower jaw, rostral 2/3 of tongue (taste and touch), and auriculotemporal area. Motor to muscles of mastication.

Answer 43

Mandibular branch of CN V

Question 44

Sensory from upper lip, nasal mucosa, lateral aspect of palpebrae.

Answer 44

Maxillary branch of CN V

Question 45

Sensory from globe, periorbita, nasal mucosa, medial aspect of palpebrae.

Answer 45

Ophthalmic branch of CN V

Question 46

Motor to dorsal oblique muscle

Answer 46

CN IV

Question 47

Motor to DVM rectus muscles, ventral oblique muscle, and levator palpebrae superioris muscle. Parasympathetic to ciliary ganglia (iris sphincter)

Answer 47

CN III

Question 48

Sensory from retina (vision)

Answer 48

CN II

Question 49

Sensory from olfactory epithelium (smell)

Answer 49

CN I