Abductor Pollicis Brevis

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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 …


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

More Anatomy

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Check out strengthening exercises for the rotator cuff


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