O&I sheet 4- Extensor pollicis longus- abductor pollicis longus

abductor pollicis longus action

1. abducts the first metacarpal 2. radially deviates the wrist 3. assists to extend & rotate the thumb 4. flexes the wrist

extensor pollicis brevis action

1. extends the proximal phalanx and 1st metacarpal of the thumb 2. radially deviates the wrist

extensor pollicis longus action

1. extends the proximal phalanx and 1st metacarpal of the thumb 2. radially deviates the wrist

extensor pollicis brevis origin

1. posterior surface of radius (below abd poll longus) 2. interosseous membrane

extensor pollicis longus origin

1. posterior surface of ulna 2. interosseous membrane

abductor pollicis longus origin

1. posterior surface of ulna and radius 2. interosseous membrane

abductor pollicis longus insertion

Lateral aspect of base of 1st metacarpal

extensor pollicis brevis insertion

base of proximal phalanx of thumb

extensor pollicis longus insertion

distal phalanx of thumb

abductor pollicis longus innervation

radial nerve

extensor pollicis brevis innervation

radial nerve

extensor pollicis longus innervation

radial nerve