The Cranial Nerves

Question 1

I - Olfactory

Accepted Answer

Sensory Olfaction (smelling) [Exits before the level of the midbrain]

Question 2

II - Optic

Accepted Answer

Sensory Vision; pupillary light reflex (restriction of pupil)

Question 3

III - Occulomotor

Accepted Answer

Motor Eyeball movement; upper eyelid elevation Parasympathetic Pupillary constriction & accomodation

Question 4

IV - Trochlear

Accepted Answer

Motor Eyeball movement [Exists via dorsal aspect of the midbrain]

Question 5

V - Trigeminal

Accepted Answer

Sensory Sensation of the face (touch) Motor Mouth opening/closing (innervate chewing muscles)

Question 6

VI - Abducens

Accepted Answer

Motor Eyeball movement

Question 7

VII - Facial

Accepted Answer

Sensory Taste (front of tongue) Motor Facial expression Parasympathetic Salivation & lacrimation (tears)

Question 8

VIII - Vestibulocholclear

Accepted Answer

Sensory Vestibular sensation (head positions/movement); hearing

Question 9

IX - Glossopharangeal

Accepted Answer

Sensory Throat & ear sensation; taste (back of tongue); chemoreception; baroreception Motor Swallowing Parasympathetic Salivation

Question 10

X - Vagus

Accepted Answer

Sensory Sensation of oesophagus, pharynx, larynx; visceral sensation Motor Speech; swallowing; cough Parasympathetic Innervation of cardiac muscle, smooth muscle, CV glands, respiratory tracts, GI tracts

Question 11

XI Accessory (Spinal roots)

Accepted Answer

Motor Head & shoulder movement (accessory muscles of forced inspiration)

Question 12

XII Hypoglossal

Accepted Answer

Motor Tongue movement

Question 13

Name the cranial nerves using the pneumonic below: Oh, oh, oh, to, touch, and, feel, very, green, vans, ah, heaven

Accepted Answer

Olfactory Optic Occulomotor Trochlear Trigeminal Abducens Facial Vestibulocholchlear Glossopharangeal Vagus Accessory Hypoglossal

Question 14

Cranial nerves involved in eye movement (motor)

Accepted Answer

III Occulomotor IV Trochlear VI Abducens

Question 15

Cranial nerves exiting at the level of the midbrain

Accepted Answer

III Occulomotor IV Trochlear (Dorsal aspect)

Question 16

Cranial nerves exiting at the level of the pons

Accepted Answer

V Trigeminal VI Abducens VII Facial VIII Vestibulocholchlear

Question 17

Cranial nerves exiting at the level of the medulla oblongata

Accepted Answer

IX Glossopharangeal X Vagus XI (Spinal) Accessory XII Hypoglossal

Question 18

Cranial nerves involved in pupillary movement

Accepted Answer

II Optic (sensory) - reflex III Occulomotor (parasympathetic) - accomodation

Question 19

Cranial nerves involved in eating

Accepted Answer

Smelling - I Olfactory (sensory)

Chewing - V Trigeminal (motor)

Taste - VII Facial + IX Glossopharangeal (sensory)

Salivation - VII facial + IX Glossopharangeal (parasympathetic)

Swallowing - X Glossopharangeal + X Vagus (motor)

Tongue movement - XII Hypoglossal (motor)

GI Tract innervation - X Vagus (parasympathetic)

Question 20

Cranial nerves involved in speech

Accepted Answer

Mouth movement - V Trigeminal Facial expression - VII Facial Head position; hearing - VIII Vestibulocholclear Speech - X Vagus Tongue movement - XI Hypoglossal

The Cranial Nerves

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