Intrinsic muscles of the hand Flashcards
Adductor Pollicis Brevis
o- tubercles of scaphoid and trapezium and adjacent flexor retinaculum
I- proximal phalanx and extensor hood of the thumb
I- median nerve T1
A- abducts the thumb at the metacarpophalangeal joint
Flexor Pollicis Brevis
O- tubercle of the tapezium and flexor retinaculum
I- proximal phalanx of the thumb
I- median nerve T1
A- flexes the thumb at the metacarpophalangeal joint
Opponens Pollicis
O- tubercle of the trapezium and flexor retinaculum
I- lateral margin and adjacent palmar surface of metacarpal 1
I- median nerve T1
A- medially rotates the thumb
What muscles are in the thenar eminence?
adductor pollicis brevis
flexor pollicis brevis
opponents pollicis
What do muscles in the thenar eminence do?
Muscles are associated with opposition of the thumb to the fingers and with precision movements
responsible for prominent swelling on the lateral side of the palm at the base of the thumb
Abductor Digiti Minimi
O- pisiform, the pisohamate ligament and tendon of flexor carpi ulnaris
I- proximal phalanx of little finger
I- ulnar nerve T1
A- abducts little finger at metacarpophalangeal joint
Flexor Digiti minimi brevis
O- hook of the hamate and flexor retinaculum
I- proximal phalanx of little finger
I- deep branch of ulnar nerve T1
A- flexes little finger at metacarpophalangeal joint
Opponens Digiti Minimi
O- hook of hamate and flexor retinacuulum
I- medial aspect of metacarpals
I- ulnar nerve T1
A- laterally rotates metacarpal 5
Palmaris Brevis
O- palmar aponeurosis and flexor retinaculum
I- dermis of the skin on the medial margin of the hand
I- ulnar nerve T1
A- improves grip
What are the muscles on the hypothenar eminence?
Abductor Digiti Minimi
Flexor Digiti Minimi Brevis
Opponeris Digiti Minimi
Palmaris Brevis
What do the hypothenar muscles do?
grasp larger objects
