80 Flashcards
What is the function of the dorsal interossei muscles?
The dorsal interossei abduct the fingers.
What is the function of the palmar interossei muscles?
The palmar interossei adduct the fingers.
What mnemonic can help remember the functions of the interossei muscles?
The mnemonic is DAB for “dorsal abduct” and PAD for “palmar adduct.”
What is the Z-movement in hand muscle function?
The Z-movement is the simultaneous flexion at the metacarpophalangeal joints and extension of the interphalangeal joints, facilitated by the lumbricals and interossei.
What condition occurs in ulnar nerve paralysis related to hand muscles?
Claw hand occurs when the interossei and the 3rd and 4th lumbricals fail to produce the Z-movement.
How is the dorsal interossei muscle tested?
To test the dorsal interossei, the examiner holds adjacent extended fingers and applies resistance as the person attempts to abduct them.
