Cranial Nerves

Question 1

I name M S or B?

Answer 1

Olfactory, S

Question 2

II name M S or B?

Answer 2

Optic, S

contributes the afferent limb of the pupillary reflex

passes through the optic foramen and groove

Question 3

III name M S or B?

Answer 3

Oculomotor, M

Superior rectus, Medial rectus, Inferior rectus,
Inferior oblique

III is motor with a parasympathetic component of CN III
mediating the efferent limb of the pupillary reflex via the ciliary ganglion

Question 4

IV name M S or B?

Answer 4

Trochlear, M

Superior oblique

Question 5

V name M S or B?

Answer 5

Trigeminal, M & S

Muscles of mastication
S Mucous membranes of mouth, nose and paranasal air sinuses and skin of head and face

a large nerve with ophthalmic (V1) forehead and upper eyelid and nose, maxillary (V2)carries sensation
from around the cheekbones and from the sinus and nose and mandibular divisions (V3)sensation from the lower jaw and innervates the muscles of mastication

Question 6

VI name M S or B?

Answer 6

Abducens, M

Lateral rectus

Question 7

VII name M S or B?

Answer 7

Facial, M & S

Muscles of facial expression

Taste fibres from anterior 2/3 of the tongue Sensory
fibres from external ear

passes through the cerebellopontine angle and the parotid gland

Question 8

VIII name M S or B?

Answer 8

Vestibulocochlear, S

mediates hearing and vestibular balance

passes through the cerebellopontine angle with the facial nerve

Question 9

IX name M S or B?

Answer 9

Glossopharyngeal, M & S

Stylopharyngeus muscle
S Pharynx and posterior 1/3
of the tongue

passes through the jugular foramen

Question 10

X name M S or B?

Answer 10

Vagus, M & S

M Muscles of larynx, pharynx and palate involved in speech
S Larynx
Portion of external auditory meatus Viscerosensory from gastrointestinal tract, lungs, heart and aortic arch
AN Parasympathetic innervation of bronchi, bronchioles, atria of heart, liver, gallbladder, pancreas, oesophagus,
stomach, gut (to colonic flexure) and kidneys

Question 11

XI name M S or B?

Answer 11

Accessory, M

Cranial roots: muscles of palate, larynx and pharynx Spinal roots: trapezius and sternocleidomastoid muscles

passes through the foramen magnum and jugular foramen

Question 12

XII name M S or B?

Answer 12

Hypoglossal, M

Muscles of the tongue

passes through the hypoglossal canal