Muscles of the Hand Flashcards
How many total hand muscles are there?
20
How many are innervated by the median n.?
5
How many are innervated by the ulnar n.?
15
What are the muscles of the thenar eminence?
Abductor pollicis brevis, flexor pollicis brevis, opponens pollicis mm.
What nerve innervates the muscles of the thenar eminence?
Median nerve
What are the muscles of the hypothenar eminence?
Abductor digiti minimi, flexor digiti minimi, opponens digiti minimi mm.
What nerve innervates the hypothenar eminence muscles?
Ulnar n.
What nerve innervates lumbricals 1 and 2?
Median nerve
What nerve innervates lumbricals 3 and 4?
Ulnar nerve
What are the actions of the lumbricals?
Flex at the metacarpophalangeal joints, extend at the interphalangeal joints.
What are the only muscles innervated by the median nerve in the hand?
Lumbricals 1 and 2, thenar eminence muscles
A- Adductor pollicis
Adduction of the thumb
Inn- Adductor pollicis
ulnar nerve
A- Palmar interosseus muscles
Adduction of the digits (PAD)
A- Dorsal interosseous muscles
Abduction of the digits (DAB)