Cranial Nerves (3)

first order neuron

conveys info to spinal cord

second-order neuron

conveys info to thalamus

third order neuron

conveys info to cerebral cortex

dyesthesia

distorted sense of touch - pain, burning, itchy

paresthesia

abnormal tingling or pins and needles

allodynia

pain with stimulus that doesn’t provoke pain

hyperalgesia

excess pain in response to pain stimulus

CN I, II

nerves which arise as extensions of CNS

CN XI

nerve which arises from the spinal cord

functions of cranial nerves

supply voluntary motor innervation

transmit sensory info

transmit special/visceral sensory info

provide parasympathetic regulation (visceral motor)

CN I

olfactory/smell

sensory

CNII

optic/reflexes such as accomodation

sensory

CNIII

Oculomotor - movement of extraocular muscles

efferent pupillary and accomodation reflexes

vestibulo-ocular reflex VOR

motor

CNIV

trochlear - movement extraocular muscles

VOR reflex

works with another CN (1)

motor

CNV

trigeminal - sensory to face/eye/anterior 2/3 of tongue

motor to muscles of mastication

corneal reflex afferent

sensory and motor (both)

CNVI

abducens - movement extraocular muscles

VOR reflex

works with another CN

motor

CNVII

facial - muscles of facial expression and efferent signs of corneal reflex

sensory to taste anterior 2/3 of tongue

lacrimal/salivary glands

sensory and motor (both)

CNVIII

vestibocochlear - sensory of vestibular system and cochlear branch (hearing)

VOR reflex

sensory

CNIX

glossopharyngeal - sensory to posterior 1/3 of tongue, visceral afferents from carotid body and sinus

motor to swallowing muscle, parotid glands

motor and sensory (both)

CNX

vagus - sensory to larynx/pharynx and visceral thorax/abdomen

motor to same areas and soft palate, efferent for gag and swallowing

motor and sensory (both)

CNXI

accessory - motor to SCM and trapezius

motor

CNXII

hypoglossal - motor to intrinsic/extrinsic muscles of tongue

motor

CNIII

red

CNVI

blue

CNXII

purple

CNVI

light blue

CNVII

light green

CNVIII

pink purple

CNIX

pink

CNX

neon blue

CNXI

neon green

pupillary light reflex

afferent limb - CNII

efferent limb - CNIII

pupils sconstricting with light added

VOR reflex

afferent - CNVIII

efferent - CNIII/VI

eyes to opposite direction of head turning