Brachioplexis Flashcards
claw hand and wrist weakness is assoc with which nerve
ulnar nerve
ulnar nerve contributes to flexion at
the wrist
radial nerve is composed what what 4 nerve fibers?
c5-c8
3 plases radial nerve can be lesioned
- axilla (saturday night palsy or using crutches), 2. mid shaft of humerus at radial groove/lateral elbow
- wrist
injury to radial nerve at the axilla (saturday night palsy or using crutches causes what 4 symp?
- loss of extension at elbow/wrist and MP joints
- weakened suppination
- sensory loss on post. arm, forearm, and dorsum of thumb
- wrist drop
wrist drop is associated with injury to which arm?
radial (C5-8)
injury to mid-shaft of humerus at radial groove or lat. elbow causes what 4 signs
- loss of forearm extensors of the wrist and MP joints
- weakened suppination
- sensory loss on the post. forearm and dorsum of hte thumb
- wrist drip
lesion of radial nerve at the wrist causes what symp?
sensory loss only on the dorsal aspect of the thumb *first dorsalweb space)
is there any motor loss resulting from a wrist lesion of the radial nerve?
no, only sensory loss on the dorsal aspect of the thumb *first dorsalweb space)
median nerve lesions occur at what two places?
elbow (supracondylar fracture of humerus) and wrist (carpal tunnel or laceration)
median nerve is composed of what nerve roots
C6, C7, C8, T1
median nerve lesion at the elbow causes what 7 signs?
- weakened wrist flexion (with ulnar deviation)
- loss of pronation
- loss of lexion of lat. 3 digits - inability to make complete fist (hand of benediction)
- loss of thump opposition (opponens pollicis muscle) - ape (simian hand)
- loss of first two lumbricals
- thenar atrophy
- sensory loss of palmar surface of the lateral hand and the palmar surfaces of the lat 3.5 digits
injury to which nerve in the brachial plexus gives you ape hand and hand of benediction? where would you get both?
median (C6, 7, 8, T1) at the elbow
lesions to the median nerve at the wris (carpal tunnel or laceration) causes what 4 symp
- loss of thumb oppositions (opponens pollicis muscle)- Ape or simian hand
- loss of first two lumbricals
- thenar atrophy
- 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
ulnar nerve is composed of what two nerve roots?
C8 and T1
the ulnar nerve can be affected by lesions where 4 places)?
elbow (medial epicondyle)
wrist
fracture of hook of hamate
midshaft clavicle fracture
ulnar nerve lesions cause which 8 things?
- loss of hypothenar muscles, third and fourth lumbricals, all interossei and adductor pollicis muscles
- w/elbow lesion there is minimal weakening of wrist flexion w/radial deviation
- loss of abduction and adduction of digits 2-5 (interosseus muscles)
- weakened IP extension of digits 2-5 (more pronounced in digits 4 and 5)
- loss of thumb adduction
- atrophy of hypothenar eminence
- “claw hand”- which is greater with a wrist lesion
- sensory loss on medial 1.5 medial digits
axillary nerve is composed of what two nerve fibers?
C5, C6
lesion of the axillary nerve can happen from what 2 injuries?
fracture of the surgical neck of the humerus or inf. dislocation of the shoulder
axillary nerve lesions lead to what 2 symptoms
- loss of abduction of the arm to the horizon
2. sensory loss over the deltoid muscle
the musculocutaneous nerve is composed of what nerve fibers?
C5, C6, C7
injuries of the musculocutaneous nerve result in what two symp?
- loss of elbow flexion and weakness in supination
2. loss of sensation on lateral aspect of the forearm
