Cranial Nerves - functions and nerve reflexes

Olfactory nerve (CN I)

sensory only

Optic Nerve (CN II)

Sensory only

Oculomotor nerve (CN III)

Motor only

Trochlear Nerves (CN IV)

Motor only

trigeminal nerve (CN V)

Both - mixed sensory and motor

Abducens nerve (VI)

motor only

Facial Nerve (CN VII)

Both - mixed sensory and motor

Vestibulocochlear Nerve (CN VIII)

sensory only

Glossopharyngeal nerve (CN IX)

Both - mixed sensory and motor

Vagus Nerve (CN X)

Both - mixed sensory and motor

Accessory Nerve (CN XI)

motor only

Hypoglossal Nerve (CN XII)

motor only

olfactory nerve function

smell

optic nerve function

vision

oculomotor nerve function

movement of eyeballs and upper lip

adjusts lens for near vision (accommodation)

constriction of pupil

trochlear nerve function

movement of eyeballs

trigeminal nerve function

touch, pain, and thermal sensations from scalp, face, and oral cavity

chewing and controls middle ear muscle

abducens nerve function

movement of eyeballs

facial nerve function

taste

touch, pain, and thermal sensations from skin is external ear canal

control of muscles of facial expression and middle ear muscle

secretion of tears and saliva

vestibulocochlear nerve function

hearing and equilibrium

glossopharyngeal nerve function

taste

secretion of saliva

swallowing

monitors blood pressure and oxygen and carbon dioxide levels in blood

touch, pain, and thermal sensations from skin of external ear and upper pharynx

vagus nerve function

taste

monitors blood pressure and oxygen and carbon dioxide levels in blood

touch, pain, and thermal sensations from skin of external eat

swallowing, vocalization, and coughing

motility and secretion of gastrointestinal organs

decreases heart rate

constriction of respiratory passageways

accessory nerve function

movement of head and pectoral girdle

hypoglossal nerve function

speech, manipulation of food, swallowing

cranial reflexes

reflex responses in cranial nerves

pupillary light reflex

pupil diameter

CN II and III (optic and oculomotor)

Accommodation reflex

focusing of the eye on a near object

CN II and III (optic and oculomotor)

Corneal reflex

Blink reflex

CN V and VII (Trigeminal and Facial)

Vestibulo-ocular reflex

stimulating the inner ear activates the eyes

CN VIII, III, IV, VI (vestibulocochlear, oculomotor, trochlear, abducens)

gag reflex

Gagging

CN IX & X (Glossopharyngeal & Vagus)