Extensor Policis Brevis

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Extensor Pollicis Brevis mm    Extensor Pollicis Brevis: Origin and Insertion 
  Extensor Policis Brevis

Origin:  Body of the interosseous membrane and radius distal to the adductor pollicis longus origin.

Insertion: Base of the first phalanx of the thumb.

Innervation: Deep radial nerve ( C6. C7)

Actions: Extends thumb and abducts wrist.

Daily uses: Opening hand to pick up jar.

 

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Other muscles …

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

 

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

Subscapularis

Origin: Anterior (costal) surface of the scapula

Insertion: Lesser tuberosity of the humerus

Actions: Internal rotation
, Adduction

Innervation: Upper and lower subscapular nerves

Daily uses: Tucking the back of your shirt into your trousers

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