18. Extensor Indicis- Abductor Pollicis Longus

Abductor Pollicis Longus Action

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

Extensor Pollicis Longus Action

1. extends distal phalanx of thumb 2. extends proximal phalanx of thumb 3. assists to extend the wrist (if fingers are flexed)

Extensor Indicis Action

1. extends the 2nd digit 2. adducts the 2nd digit 3. assists to extend the wrist 4. stabilizes McP joint for flexion of IP solely

Extensor Pollicis Brevis Action

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

Supinator Origin

1. lateral epicondyle 2. supinator crest 3. radial collateral and annular ligament

Extensor Pollicis Brevis Origin

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

Extensor Indicis Origin

1. posterior surface of ulna 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

Supinator Action

1. supinates the forearm

Extensor Indicis Insertion

Base of middle and distal phalanx of index finger

Extensor Pollicis Brevis Insertion

Base of proximal phalanx of thumb

Extensor Pollicis Longus Insertion

Distal phalanx of thumb

Abductor Pollicis Longus Insertion

Lateral aspect of base of 1st metacarpal

Supinator Insertion

Proximal and anterolateral surface of radius

Abductor Pollicis Longus Innervation

radial nerve

Extensor Indicis Innervation

radial nerve

Extensor Pollicis Brevis Innervation

radial nerve

Extensor Pollicis Longus Innervation

radial nerve

Supinator Innervation

radial nerve