exam 3 nerves Flashcards
name of CN I
olfactory
name of CN II
optic
name of CN III
oculomotor
name of CN IV
trochlear
name of CN V
trigeminal
name of CN VI
abducens
name of CN VII
facial
name of CN VIII
vestibulocochlear
name of CN IX
glossopharyngeal
name of CN X
vagus
name of CN XI
accessory
name of CN XII
hypoglossal
which nerves are sensory only
I, II, VIII
which nerves are motor only
III, IV, VI, XI, XII
which nerves are mixed
V, VII, IX, X
location of olfactory nerve
axons from olfactory bulb
function of olfactory nerve
smell, from breathing in nose, goes through cribriform plate of ethmoid bone
location of optic nerve
spans from the optic chiasm to eyeball, specifically connects to blind spot in eye
function of optic nerve
sight, take photoreceptors to brain, travels through optic canal of spheniod bone
location of vestibulocochlear nerve
connects ear to brain
function of vestibulocochlear nerve
collects info about equilibrium and controls hearing and balance
location of oculomotor nerve
travels through superior orbital fissure of the sphenoid bone
function of oculomotor nerve
moves the eye, constricts pupil, adjusts lens
- connects to iris and ciliary body
- moves superior, medial, and inferior rectus, and inferior oblique
function of trochlear nerve
moves superior oblique muscles, inferior and lateral
location of abducens
moves lateral rectus, abducts eye
function of accessory nerve
attaches trapezius and sternocleidomastoid
function of hypoglossal nerve
attaches to several muscles of tongue
function of trigeminal nerve
3 branches of nerves that are the muscles of mastication (temporalis, masseter, pterygoid)
what are the 3 branches of the trigeminal nerve
V1: ophthalmic
V2: maxillary
V3: mandibular (motor paart)
function of facial nerve
muscles of facial expression
- provides sensory innervation to anterior tongue and glands
- taste sensation 2/3 anterior tongue
location of facial nerve
junction of pons/medulla through parotid gland to facee
location of glossopharyngeal nerve
lateral medulla to pharynx/neck
function of glossopharyngeal nerve
sensory to throat
- motor to 1 little nerve
- innervates parotid gland to produce saliva to produce saliva
- innervates carotid body to detect blood pressure
- sensory to posterior 1/3 tongue
- DETERMINES texture
function of vagus nerve
sensory and motor to smooth muscle, cardiac muscle, and glands in thorax and abdomen
“ the wonderer”
what nerve senses a piece of food in throat?
glossopharyngeal (IX)
what nerve causes muscles to respond?
vagus (X)
how many pairs of spinal nerves are there
31
how many cervical nerves are there? and what is the location?
8
C1-C8
how many thoracic nerves are there? and what is the location?
12
T1-T12
how many lumbar nerves are there? and what is the location?
5
L1-L5
how many sacral nerves are there? and what is the location?
5
S1-S5
how many coccygeal nerves are there? and what is the location?
1
Coc 1
which nerve system are spinal nerves located
PNS but connected to CNS
what are the major differences between spinal and cranial nerves
- spinal nerve connected to spinal cord, not brain
- arabic numbers, not roman
- generally longer
anterior root contains what kind of axons
motor neuron axons
posterior root contains what kind of axons
sensory neuron axons
spinal nerve contains what kind of axons
motor and sensory axons
function of posterior primary ramus
takes sensory and motor info to the back (of body)
function of anterior primary ramus
takes sensory and motor info to the rest of the body
dermatomes
single spinal nerve sensory innervation
nerve plexus
a network of converging and/or diverging axon
- usually from anterior primary rami
- thoracic nerves don’t form plexus bc of ribs
location of cervical plexus
anterior rami of C1-C5 spinal nerves
function of cervical plexus
- sensory: skin of neck, ear & shoulders
- motor: anterior neck muscles
location of phrenic nerve
down through thorax
C3, C4, C5
function of phrenic nerve
supplies diaphragm
helps assist breathing, life or death
brachial plexus lcoation
anterior rami of C5-T1 spinal nerves
function of brachial plexus
innervates motor and sensory of upper limb
nerves of the brachial plexus
axillary musculocutaneous radial median ulnar
function of axillary nerve
sensory: lateral shoulder
motor: deltoid and teres major
location of axillary nerve
posterior of humerous
function of musculocutaneous nerve
sensory: lateral forearm
motor: most muscles on anterior surface arm
- coracobrachialis
- biceps brachii
- brachialis
function of radial nerve
sensory: posterior arm, forearm, hand
motor: posterior arm and forearm
function of median nerve
sensory: lateral palm of hand
motor: most anterior forearm muscles, thenar, lumbricals of fingers 2 and 3
function of ulnar nerve
sensory: medial hand
motor:
anterior forearm
- medial 1/2 flexor digitorum profundus
- flexor carpi ulnaris
hand
- hypothenar
- lumbricals 4 and 5
- interossei
location of lumbar plexus
anterior rami of L1-L4 spinal nerves
function of lumbar plexus
innervates inferior abdominal wall and part of lower limb
nerves of lumbar plexus
femoral and obturator
function of femoral nerve
sensory: anterior thigh
motor: anterior thigh, extend knee
function of obturator nerve
sensory: medial thigh
motor: medial thigh (abductor)
location of sacral plexus
anterior rami of L4, L5, and S1, S2, S3 spinal nerves
function of sacral plexus
innervates buttocks, pelvic structures and majority of lower limb
nerves of sacral plexus
sciatic
tibial
common fibular
function of sciatic nerve
splits into tibial and common fibular nerve
function of tibial nerve
sensory: posterior leg/sole of foot
motor: muscles of most posterior thigh, posterior leg, sole of foot
function of common fibular nerve
sensory: anterior and lateral leg, dorsum of leg
motor: muscles of anterior and lateral leg, dorsum of foot
