Spinal Nerves Lecture

segments of skin innervated by a single spinal nerve are called _____

dermatomes

roots are organized by _____

function

rami are organized by _____

location

spinal nerves are _____ than cranial nerves

longer

the anterior rami of L1-L4 spinal nerves are part of the _____ _____

lumbar plexus

the femoral nerve is part of the _____ _____

lumbar plexus

the obturator nerve is part of the _____ _____

lumbar plexus

the radial nerve is motor to

posterior arm and forearm

the radial nerve is sensory to

posterior arm, forearm, hand

the tibial nerve is sensory to

posterior leg and sole of foot

the tibial nerve is motor to

posterior thigh and leg and sole of foot

the ulnar nerve is motor to

medial half of flexor digitorum profundus, flexor carpi ulnaris, hypothenar, lumbricals 4 and 5, and interossei

the ulnar nerve is sensory to

medial hand

the obturator nerve is motor to

medial thigh

the obturator nerve is sensory to

medial thigh

an anterior root contains axons from _____ neurons

motor

the brachial plexus nerves include MARMU which stand for

musculocutaneous, axillary, radial, median, ulnar

spinal nerves split into two main branches called _____

rami

the anterior primary ramus innervates everything from the _____ _____

neck inferiorly

a structure you see with the naked eye is called a _____

nerve

a network of converging or diverging axons is a _____ _____

nerve plexus

the anterior primary ramus forms _____ _____

nerve plexuses

axons wrapped in connective tissue layers are called _____

nerves

each spinal nerve is formed from an anterior and posterior _____

root

the anterior rami of L4-S4 spinal nerves are part of the _____ _____

sacral plexus

the common fibular nerve is part of the _____ _____

sacral plexus

the sciatic nerve is part of the _____ _____

sacral plexus

the tibial nerve is part of the _____ _____

sacral plexus

the _____ _____ splits into the tibial nerve and common fibular nerve

sciatic nerve

a posterior root contains axons from _____ neurons

sensory

in the posterior root ganglion there are cell bodies of _____ neurons

sensory

dermatomes create a _____ _____ of the body

sensory map

all brachial plexus nerves have both _____ and _____ components

sensory, motor

each nerve in the lumbar plexus has both _____ and _____ components

sensory, motor

each nerve in the sacral plexus has both _____ and _____ components

sensory, motor

chickenpox virus latent in posterior root ganglia that reactivates along dermatome is called _____

shingles

the cervical plexus sensory innervates the

skin of neck, ear, and shoulders

posterior primary ramus are _____ than anterior primary ramus

smaller

a spinal nerve comes directly off the _____ _____

spinal cord

when an anterior and posterior root unite, they form a _____ _____

spinal nerve

the femoral nerve is sensory to

anterior and inferomedial thigh and medial leg and foot

the common fibular nerve is motor to

anterior and lateral leg and dorsum of foot

the common fibular nerve is sensory to

anterior and lateral leg and dorsum of foot

the median nerve is motor to

anterior forearm, thenar, and lumbricals 2 and 3

the cervical plexus motor innervates the

anterior neck

nerve plexuses are usually formed from _____ _____ _____

anterior primary rami

the femoral nerve is motor to

anterior thigh

the posterior primary ramus innervates deep _____ muscles and _____ of _____

back, skin, back

the anterior rami of C5-T1 spinal nerves are the _____ _____

brachial plexus

anterior rami of C1-C4 spinal nerves is the _____ _____

cervical plexus

the phrenic nerve is part of the _____ _____

cervical plexus

the musculocutaneous nerve is motor to

coracobrachialis, biceps brachii, and brachialis

the axillary nerve is motor to

deltoid and teres minor

there are _____ lumbar spinal nerves

5

there are _____ sacral spinal nerves

5

there are _____ coccygeal spinal nerves

1

there are _____ thoracic spinal nerves

12

there are _____ pairs of spinal nerves

31

there are _____ cervical spinal nerves

8

the phrenic nerve controls

C3, C4, C5

spinal nerves are part of the _____

PNS

the sacral plexus innervates the

butt, pelvic structures, and lower limb

the phrenic nerve supplies the

diaphragm

C3, C4, C5 keeps the _____ _____

diaphragm alive

the lumbar plexus innervates the

inferior abdominal wall and lower limb

the musculocutaneous nerve is sensory to

lateral forearm

the median nerve is sensory to

lateral palm of hand

the axillary nerve is sensory to

lateral shoulder

the brachial plexus primarily innervates the

upper limb