Chapter 14 - The Peripheral Nervous System

What are nerves

bundles of peripheral axons

what are ganglia

clusters of peripheral neuronal cell bodies

Spinal nerve is where what four things meet

dorsal root, ventral root, dorsal ramus, and ventral ramus

Where do cranial nerves one and two attach

to the forebrain

Cranial nerve 1 is

olfactory

olfactory nerve is sensory, motor or both

sensory

cranial nerve 2 is

optic

optic nerve is sensory, motor or both

sensory

cranial nerve 3 is

oculomotor

oculomotor is sensory, motor or both

motor (duh)

cranial nerve 4 is

trochlear

Trochlear nerve is sensory, motor or both

motor

cranial nerve 5 is

trigeminal

trigeminal is sensory, motor or both

both

cranial nerve 6 is

abducens

abducens is sensory, motor or both

motor

cranial nerve 7 is

facial

facial nerve is sensory, motor or both

both

cranial nerve 8 is

vestibulocochlear

vestibulocochlear is sensory, motor or both

sensory

cranial nerve 9 is

glossopharyngeal

glossopharyngeal is sensory, motor or both

both

cranial nerve 10 is

vagus

vagus is sensory, motor or both

both

cranial nerve 11 is

accessory

accessory is sensory, motor or both

motor

cranial nerve 12 is

hypoglossal

hypoglossal is sensory, motor or both

motor

What is unique about the vagus nerve

it is the wanderer that innervates things away from head

how many spinal nerves are there

31

In cervical region, the corresponding spinal nerve to the vertebrae exits superiorly or inferiorly

superiorly (ex. C4 spinal nerve exits above C4 vertebrae)

In all regions except the cervical region, the corresponding spinal nerve to the vertebrae exits superiorly or inferiorly

inferiorly (ex. T1 spinal nerve exits below T1 vertebrae)

How do spinal nerves connect to the spinal cord

by dorsal and ventral roots

Dorsal roots contain what

sensory fibers and dorsal root ganglion

Ventral roots contain what

motor fibers

Branches of spinal nerves contain what

sensory and motor fibers

Ventral rami (except T2 - T12) do what?

form nerve plexuses

Do dorsal rami form plexuses?

no

What is the most important nerve in the cervical plexus

phrenic nerve

what does the phrenic nerve do

motor nerve that controls the diaphragm

Which spinal nerves make up the brachial plexus

C5-T1

What does the musculocutaneous nerve innervate

anterior of arm

What does the median nerve innervate

anterior forearm

What does the ulnar nerve innervate

intrinsic muscles of hand

What does the radial nerve innervate

posterior arm and forearm

What does the axillary nerve innervate

deltoid and teres minor

What spinal nerves make up the lumbar plexus

L1-L4

What does the femoral nerve innervate

anterior thigh

What does the obturator nerve innervate

adductor muscles (medial thigh)

What two nerves make up the sciatic nerve

tibial and common fibular

What does the tibial nerve innervate

posterior lower limb

What does the common fibular nerve innervate

anterior and lateral leg