Topic 13: Spinal Nerves

Question 1

component of sensory nerves that contain sensory fibers

Answer 1

dorsal root

Question 2

location of cell bodies of spinal nerves

Answer 2

dorsal root ganglia

Question 3

component of sensory nerves that contains the motor fibers arising from anterior (ventral) gray column

Answer 3

ventral root

Question 4

two branches of spinal nerves

Answer 4

dorsal ramus

ventral ramus

Question 5

branch of spinal nerve that innervate the back

Answer 5

dorsal rami

Question 6

branch of spinal nerve that innervate the thoracic wall

Answer 6

ventral rami

Question 7

in thorax, ventral ramus continues as _______

Answer 7

intercostal nerve

Question 8

2 branches of intercostal nerve

Answer 8

lateral and anterior cutaneous branches

Question 9

network of nerves formed by ventral rami from peripheral nerves (except T2-T12)

Answer 9

Nerve Plexus

Question 10

Most important nerve of the cervical plexus and innervates the mediastinal pleura, pericardium and diaphragm

Answer 10

Phrenic nerve

Question 11

main branch of the lateral cord of brachial plexus

Answer 11

musculocutaneous nerve

Question 12

originates from both lateral and medial cords of brachial plexus

Answer 12

median nerve

Question 13

branches from the medial cord of brachial plexus

Answer 13

ulnar nerve

Question 14

musculocutaneous nerve innervates which muscles?

Answer 14

anterior arm biceps, brachii, and brachoalis & sensory dermis of part of forearm

Question 15

median nerve innervates which muscles?

Answer 15

anterior forearm muscles, lumbrical muscles to digits 2&3, thenar muscles and sensory dermis of lateral palm

Question 16

ulnar nerve innervates which muscles?

Answer 16

intrinsic hand muscles, lumbrical digits 4& 5, hypothenar muscles and sensory dermis of the medial hanf

Question 17

elbow injury to which nerve causes diminished innervation of flexor muscles of forearm which reduces ability to flex 2nd and 3rd fingers or oppose the thumb to little finger “Hand benediction”

Answer 17

median nerve injury

Question 18

intrinsic hand muscle innervation is diminished which reduces finger movement and clawhand can develop

Answer 18

ulnar nerve injury

Question 19

largest branch of the brachial plexus; innervates triceps and extensor muscles of the forearm

Answer 19

radial nerve

Question 20

innervates the deltoid and teres minor

Answer 20

axillary nerve

Question 21

lumbar plexus innervates which muscles?

Answer 21

anterior medial compartments of the thigh

Question 22

lumbar plexus innervates which dermis sensory regions?

Answer 22

anteior and medial portions of the thigh and leg

Question 23

part of lumbar plexus that innervates muscles that flex the hip and extend the leg at the knee

Answer 23

Femoral nerve

Question 24

part of the lumbar plexus that innervates medial thigh adductor muscles

Answer 24

obturator nerve

Question 25

sacral plexus innervates which mucsles?

Answer 25

posterior compartment of the thigh and all the muscles in the leg

Question 26

sacral plecus innervates which dermis sensory regions

Answer 26

lateral and posterior portions of the leg and to the foot

Question 27

the largest nerve of the sacral plexus and the thickest and longest nerve in the body

Answer 27

sciatic nerve

Question 28

sciatic nerve innervates which muscles?

Answer 28

posterior compartment of the thigh

Question 29

part of sciatic nerve that innervates most of the posterior lower limb (thigh and leg) muscles

Answer 29

tibal nerve

Question 30

part of sciatic nerve that innervates muscles of the anterolateral leg

Answer 30

common fibular (peroneal) nerve

Question 31

an area of skin innervated by cutaneous branches of a single spinal nerve

Answer 31

dermatone

Question 32

upper limb innervation of the skin

Answer 32

brachial plexus nerves

Question 33

trunk innervation of the skin

Answer 33

intercostal and subcostal nerves

Question 34

lower limb anterior surface innervation of the skin

Answer 34

lumbar plexus nerves

Question 35

lower limb posterior surface innervation of the skin

Answer 35

sacral plexus nerves

Question 36

asymetric muscle paralysis most typically of the legs; most common form

Answer 36

spinal polio

Question 37

weakness of muscles innervated by cranial nerves

Answer 37

bulbar polio

Question 38

infection of brainstem or higher in brain

Answer 38

poliocephalitis