spinal nerves

Question 1

• part of PNS
• comes directly off the spinal cord
• 31 pairs (8 cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal)

Answer 1

description of spinal nerves

Question 2

• located in PNS
• connect to CNS
• numbered according to CNS

Answer 2

spinal and cranial nerve similarities

Question 3

• connected to spinal cord (not brain)
• arabic numbers (1,2,3, etc.)
• generally longer except CN X: Vagus

Answer 3

spinal and cranial nerve differences

Question 4

axons of sensory neurons

Answer 4

posterior root

Question 5

cell bodies of sensory neurons

Answer 5

posterior root ganglion

Question 6

innervates deep back muscles and skin of back (smaller)

Answer 6

posterior primary ramus

Question 7

axons of motor neurons

Answer 7

anterior root

Question 8

axons of sensory and motor neurons

Answer 8

spinal nerve

Question 9

innervates everything else from the neck inferiorly (larger)

• also forms nerve plexuses

Answer 9

anterior primary ramus

Question 10

segments of skin innervated by a single spinal nerve; create a sensory map of the body

Answer 10

dermatomes

Question 11

chickenpox virus latent in posterior root ganglion; reactivates along dermatome

Answer 11

shingles

Question 12

organized by function

Answer 12

roots

Question 13

organized by location

Answer 13

rami

Question 14

structure you can see with the naked eye

• axons wrapped in connective tissue layers (endo-, peri-, epi-, nerium)

Answer 14

nerve

Question 15

a network of converging/diverging axons

• typically formed from anterior primary rami
• individual intercostal nerves are the anterior rami of the thoracic spinal nerves

Answer 15

nerve plexus

Question 16

• anterior rami of C1-C4 spinal nerves
• contains phrenic nerve

Answer 16

cervical plexus

Question 17

• skin of neck
• skin of ear
• skin of shoulders

Answer 17

cervical plexus sensory

Question 18

• anterior neck muscles

Answer 18

cervical plexus motor

Question 19

C3, C4, C5 supplies the diaphragm muscles

Answer 19

phrenic nerve

Question 20

anterior rami of C5-T1 spinal nerves

• primarily innervated upper limb
• consists of musculocutaneous nerve, axillary nerve, radial nerve, median nerve, and ulnar nerve

Answer 20

brachial plexus

Question 21

lateral forearm

Answer 21

musculocutaneous nerve sensory

Question 22

most muscles of anterior compartment of arm

• coracobrachialis
• biceps brachii
• brachialis

Answer 22

musculocutaneous nerve motor

Question 23

lateral shoulder

Answer 23

axillary nerve sensory

Question 24

• deltoid
• teres minor

Answer 24

axillary nerve motor

Question 25

- posterior arm - hand - forearm

Answer 25

radial nerve sensory

Question 26

- muscles of posterior arm - muscles of posterior forearm

Answer 26

radial nerve motor

Question 27

lateral palm of hand (thumb-side)

Answer 27

median nerve sensory

Question 28

- most anterior forearm muscles - hand muscles (thenar muscles, lumbricals (fingers 2-3))

Answer 28

median nerve motor

Question 29

compression of median nerve at retinaculum (median nerve damage)

Answer 29

carpal tunnel

Question 30

medial hand (pinkie side)

Answer 30

ulnar nerve sensory

Question 31

- anterior forearm (medial 1/2 of flexor digitorum profundus, flexor carpi ulnaris) - hand (hypothenar muscles, lumbricals (fingers 4-5), interossei)

Answer 31

ulnar nerve motor

Question 32

anterior rami of L1-L4 spinal nerves - innervates inferior abdominal wall and part of lower limb contains femoral nerve and obturator nerve

Answer 32

lumbar plexus

Question 33

- anterior thigh - inferomedial thigh - medial leg - medial foot

Answer 33

femoral nerve sensory

Question 34

anterior thigh muscles

Answer 34

femoral nerve motor

Question 35

medial thigh

Answer 35

obturator nerve sensory

Question 36

medial thigh muscles

Answer 36

obturator nerve motor

Question 37

anterior rami of L4-S4 spinal nerves - innervates the buttocks, pelvic structures, and majority of lower limb - consists of sciatic nerve, tibial nerve, and common fibular nerve

Answer 37

sacral plexus

Question 38

splits into tibial nerve and common fibular nerve

Answer 38

sciatic nerve

Question 39

- posterior leg - sole of foot

Answer 39

tibial nerve sensory

Question 40

- most posterior thigh muscles - posterior leg muscles - muscles on sole of foot

Answer 40

tibial nerve motor

Question 41

- anterior leg - lateral leg - dorsum of foot

Answer 41

common fibular nerve sensory

Question 42

- anterior leg muscles - lateral leg muscles - muscles on dorsum of foot

Answer 42

common fibular nerve motor