MMBAnatomyDiseases , Erbspalsy, erb’s erbs erbs palsy waiter’s tip Laura Porro, Laura Poro  , ,  flashcards, flashcard, summary,, 

 brachial plexus

Falling out a tree damages C8/T1

(affects median nerve)

(due to KO of median nerve which

innervates wrist flexors on the

dorsal side of the hand  )

Unopposed wrist extension Ulnar claw

(lumbricals normally flex

MCP, extend IP)

–>(mainly 1&2) KO’d = you

get

• FLEXION OF IP &

• EXTENSION OF MC

= CLAW HAND.

This is a passive sign – ie its like this in the

resting state)

FYI: Similar symptoms occurs when ulnar

nerve is damaged in a medial epicondyle

fracture of humerus – you get an ulnar claw

in the 4

th and 5

th

fingers due to lumbrical

damage. But don’t confuse these two

conditions – just to point out their