OINA: Back/Shoulder/Triceps (Posterior forearm) Flashcards
Superficial group
- Extensor carpi radialis brevis
- Extensor Digitorum
- Extensor Digiti minimi
- Extensor carpi ulnaris
- Anconeus
These muscles posses a common tendon of origin, which is attached to the lateral epicondyle of the humerus
Deep Group
- Supinator
- Abductor Pollicis Longus
- Extensor Pollicis brevis
- Extensor Pollicis longus
- Extensor Indicis
Blood supply
- Posterior Interosseous artery
- Anterior Interosseous arteries
Nerve Supply
-All innervated by the Deep Branch of the Radial Nerve
Extensor Carpi Radialis Brevis
O: —-
I: Posterior surface of base of 3rd metacarpal bone
N: —–
A: Extends and abducts hand at wrist jt.
Extensor Digitorum
O: —-
I: Middle and distal phalanges of medial four fingers
N: —-
A: Extends fingers and hand
Anconeus
O: —-
I: Lateral surface of olecranon process of ulna
N: Radial Nerve
A: Assists triceps in extending forearm; stabilizes elbow joint; abducts ulna during pronation
Extensor digiti minimi
O: —-
I: Extensor expansion of little finger
N: —-
A: Extends metacarpal phalangeal joint of little finger
Extensor carpi ulnaris
O: —-
I: Base of 5th metacarpal bone
N: —-
A: Extends and adducts hand at wrist
Supinator
O: Lateral epicondyle of the humerus, the radical collateral ligament, the supinator crest of the ulna, and the radial collateral and annular ligaments.
I: Proximal portion of the anterolateral surface of the radius
N: deep branch of radial nerve C7,C8 and C5,C6
A: Supination of forearm
Abductor Pollicis Longus
O: Posterior surface of shafts of radius and ulna
I:Base of first metacarpal bone
N: —-
A: Abducts and extends thumb
Extensor Pollicis Brevis
O: Posterior surface of shaft of ulna
I: Base of distal phalanx of thumb
A: Extends distal phalanx of thumb
Extensor Indicis
O: Posterior surface of shaft of ulna
I: Extensor expansion of index finger
A: Extends metacarpophalengeal joint of index finger
