Mostly Thumb Muscle O I A N Flashcards
Opponens Pollicis
O: Flexor retinaculum and tubercle of trapezium
I: Entire length of first metacarpal bone, radial side
A: Opposition of the thumb at CMC joint
N: Median
Adductor Pollicis
O: Capitate, 2nd and 3rd metacarpals
I: Base of proximal phalange of thumb
A: Adduct thumb, some flexion
N: Ulnar
Abductor Pollicis Brevis
O: Flexor retinaculum, trapezium, scaphoid tubercles
I: Base of proximal phalange of thumb
A: Abduct thumb, assist in opposition
N: Median
Flexor Pollicis Brevis
O: Superficial head - flexor retinaculum
Deep head - trapezium, trapezoid, capitate
I: Base of proximal phalange of thumb
A: Flex thumb, some opposition
N: Median and Ulnar
Abductor Pollicis Longus
O: Posterior surface of radius and ulna, interosseous membrane
I: Base of 1st metacarpal
A: Abduct thumb, extend thumb
N: Radial
Flexor Pollicis Longus
O: Anterior surface of radius and interosseous membrane
I: Distal phalange of thumb
A: Flex thumb, assist thumb flexion
N: Median
Extensor Pollicis Longus
O: Posterior surface of ulna and interosseous membrane
I: Distal phalange of thumb
A: Extend thumb
N: Radial
Extensor Pollicis Brevis
O: Posterior surface of radius and interosseous membrane
I: Proximal phalange of thumb
A: Extend thumb
N: Radial
Short n Sweet: Thumb Flexion
- Flexor Pollicis Longus
- Flexor Pollicis Brevis
- Opponens pollicis
Short N Sweet: Thumb Extension
- Extensor Pollicis Longus
- Extensor Pollicis Brevis
- Abductor Pollicis Longus
Short N Sweet: Thumb Abduction
- Abductor Pollicis Longus
- Abductor Pollicis Brevis
Short N Sweet: Thumb Adduction
-Adductor Pollicis
Short N Sweet: Thumb Opposition
- Opponens Pollicis
- Flexor Pollicis Brevis
- Abductor Pollicis Brevis
- Opponens Digit Minimi
