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