Brachioplexis

Question 1

claw hand and wrist weakness is assoc with which nerve

Answer 1

ulnar nerve

Question 2

ulnar nerve contributes to flexion at

Answer 2

the wrist

Question 3

radial nerve is composed what what 4 nerve fibers?

Answer 3

c5-c8

Question 4

3 plases radial nerve can be lesioned

Answer 4

1. axilla (saturday night palsy or using crutches), 2. mid shaft of humerus at radial groove/lateral elbow
2. wrist

Question 5

injury to radial nerve at the axilla (saturday night palsy or using crutches causes what 4 symp?

Answer 5

1. loss of extension at elbow/wrist and MP joints
2. weakened suppination
3. sensory loss on post. arm, forearm, and dorsum of thumb
4. wrist drop

Question 6

wrist drop is associated with injury to which arm?

Answer 6

radial (C5-8)

Question 7

injury to mid-shaft of humerus at radial groove or lat. elbow causes what 4 signs

Answer 7

1. loss of forearm extensors of the wrist and MP joints
2. weakened suppination
3. sensory loss on the post. forearm and dorsum of hte thumb
4. wrist drip

Question 8

lesion of radial nerve at the wrist causes what symp?

Answer 8

sensory loss only on the dorsal aspect of the thumb *first dorsalweb space)

Question 9

is there any motor loss resulting from a wrist lesion of the radial nerve?

Answer 9

no, only sensory loss on the dorsal aspect of the thumb *first dorsalweb space)

Question 10

median nerve lesions occur at what two places?

Answer 10

elbow (supracondylar fracture of humerus) and wrist (carpal tunnel or laceration)

Question 11

median nerve is composed of what nerve roots

Answer 11

C6, C7, C8, T1

Question 12

median nerve lesion at the elbow causes what 7 signs?

Answer 12

1. weakened wrist flexion (with ulnar deviation)
2. loss of pronation
3. loss of lexion of lat. 3 digits - inability to make complete fist (hand of benediction)
4. loss of thump opposition (opponens pollicis muscle) - ape (simian hand)
5. loss of first two lumbricals
6. thenar atrophy
7. sensory loss of palmar surface of the lateral hand and the palmar surfaces of the lat 3.5 digits

Question 13

injury to which nerve in the brachial plexus gives you ape hand and hand of benediction? where would you get both?

Answer 13

median (C6, 7, 8, T1) at the elbow

Question 14

lesions to the median nerve at the wris (carpal tunnel or laceration) causes what 4 symp

Answer 14

1. loss of thumb oppositions (opponens pollicis muscle)- Ape or simian hand
2. loss of first two lumbricals
3. thenar atrophy
4. sensory loss on palmar surfaces of the lat. 3.5 digits

NOTE: sensation on lat. palm may be spared because it doesn’t go through carpal tunnel

Question 15

ulnar nerve is composed of what two nerve roots?

Answer 15

C8 and T1

Question 16

the ulnar nerve can be affected by lesions where 4 places)?

Answer 16

elbow (medial epicondyle)
wrist
fracture of hook of hamate
midshaft clavicle fracture

Question 17

ulnar nerve lesions cause which 8 things?

Answer 17

1. loss of hypothenar muscles, third and fourth lumbricals, all interossei and adductor pollicis muscles
2. w/elbow lesion there is minimal weakening of wrist flexion w/radial deviation
3. loss of abduction and adduction of digits 2-5 (interosseus muscles)
4. weakened IP extension of digits 2-5 (more pronounced in digits 4 and 5)
5. loss of thumb adduction
6. atrophy of hypothenar eminence
7. “claw hand”- which is greater with a wrist lesion
8. sensory loss on medial 1.5 medial digits

Question 18

axillary nerve is composed of what two nerve fibers?

Answer 18

C5, C6

Question 19

lesion of the axillary nerve can happen from what 2 injuries?

Answer 19

fracture of the surgical neck of the humerus or inf. dislocation of the shoulder

Question 20

axillary nerve lesions lead to what 2 symptoms

Answer 20

1. loss of abduction of the arm to the horizon

2. sensory loss over the deltoid muscle

Question 21

the musculocutaneous nerve is composed of what nerve fibers?

Answer 21

C5, C6, C7

Question 22

injuries of the musculocutaneous nerve result in what two symp?

Answer 22

1. loss of elbow flexion and weakness in supination

2. loss of sensation on lateral aspect of the forearm