Extensor Pollicis Longus

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 Extensor Pollicis Longus mm    Extensor Pollicis Longus: Origin and InsertionExtensor Pollicis Longus

Origin: Upper posterior surface of the ulna

Insertion: Base of the distal phalanx of the thumb

Actions:Extension of the wrist
. Extension of the thumb

Innervation: Posterior interosseous nerve

Daily uses: Releasing your grip on an object


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Other muscles of the Upper Limb


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


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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