Nerves of the Upper limb

Question 1

Note the 2 components of the nervous system

Answer 1

CNS
Peripheral

Question 2

define afferent direction

Answer 2

Information encoded in nerve fibers is either transmitted into the CNS

Question 3

define efferent direction

Answer 3

transmitted from the CNS to the periphery

Question 4

define plexus

Answer 4

a braid, a coming together of more than one spinal nerve level of input

Question 5

define dermatomes

Answer 5

Supply areas of skin and act to carry sensory information back to CNS from skin

Question 6

define myotomes

Answer 6

A group of muscles that is innervated by the motor fibers that stem from a specific nerve root is called a myotome.

Question 7

identify the 5 terminal branches

Answer 7

Axillary, Musculocutaneous, Radial , Medial , Ulnar

Question 8

axillary nerve innervation

Answer 8

Teres minor, Deltoid Muscle - anterior

Question 9

Musculocutaneousnerves innervation

Answer 9

Biceps, brachialis, coracobrachialis - anterior

Question 10

radial nerves innervation

Answer 10

Triceps brachii, extensors of the forearm - Posterior

Question 11

medial nerve innervation

Answer 11

PQ, PT, FDS and FPL, thenar muscles and Lateral 2 lumbricals - anterior

Question 12

ulnar nerve innervation

Answer 12

FCU, FDP, hypothenar all interossei, adductor pollisicis 0 anterior and intrinsic muscles

Question 13

axillary injury impact

Answer 13

deltoid and teres minor muscles will be affected, rendering the patient unable to abduct the affected limb beyond 15 degrees.

Question 14

Musculocutaneousinjury impact

Answer 14

Flexor at the shoulder + elbow are weakened but still performed

Supination is weakened but still performed.

Question 15

radial injury impact

Answer 15

unable to extend at the forearm, wrist and fingers

loss of sensation over the lateral and posterior arm, posterior forearm, and dorsal surface of the lateral three and a half digits

Question 16

medial injury impact

Answer 16

impact the flexor muscles of the forearm and hand, as well as those muscles responsible for flexion, abduction, opposition, and extension of the thumb.

Question 17

ulnar injury impact

Answer 17

damage at the elbow muscle paralysis may cause claw hand= Due to atrophy of the hypothenar compartment and interossei with resultant muscle imbalance

Question 18

name the nerve

Answer 18

Ulna

Question 19

name the nerve

Answer 19

medial

Question 20

name the nerve

Answer 20

radial

Question 21

name the nerve

Answer 21

musculocutaneous

Question 22

name the nerve

Answer 22

axillary

Question 23

Label the diagram below to show the sensory distribution of radial, ulnar, and
median nerves.

Answer 23

blue = medial
yellow = ulnar
red = radial