Abductor Pollicis Brevis

This information has been displayed with the kind permission of  SportsInjuryClinic and Get Body Smart

 

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Abductor Pollicis Brevis

Origin: Scaphoid tubercle & flexor retinaculum

Insertion: Radial sesamoid of proximal phalanx of thumb &extensor pollicis longus tendon.

Actions: Abducts thumb at MCP & carpometacarpal joints

Innervation: C8, T1 (median nerve).

Daily uses: Opening hand to grasp jar.


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Other muscles …

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


More Anatomy

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Ligaments

Check out strengthening exercises for the rotator cuff

 

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