Supinator

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Extensor Carpi Radialis Brevis mm

Supinator 

Origin: Lateral epicondyle of humerus, ulnar, radial collateral ligaments and annular ligaments.

Insertion: Lateral and dorsal surfaces of radius.

Actions: Rotates the radius around ulna produces supination of the hand and forearm.

Innervation:  Deep radial Nerve (C6)

Daily uses: Holding a plate.

 

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Other muscles of the Upper Limb

Infraspinatus

Origin: Posterior surface of the scapula (below the spine of the scapula)
.

Insertion: Greater tuberosity on the humerus
.

Actions: Shoulder abduction, 
External rotation.

Innervation: Suprascapular nerve
.

Daily uses: Brushing hair.

Teres Minor

Origin: Mid section of the lateral border of the scapula

Insertion: Greater tuberosity on the humerus

Actions:External rotation, 
Shoulder adduction

Innervation: Axillary nerve

Daily uses: Brushing hair

Supraspinatus

Origin: Supraspinous fossa

Insertion: Greater tuberosity of the humerus

Actions: Abduction 
Stabilisation of the humerus

Innervation: Suprascapular nerve

Daily uses: Holding shopping bags away from the body


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