Abductor Pollicis Longus

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Abductor Pollicis Longus mmAbductor Pollicis Longus: Origin and Insertion
   Abductor Pollicis Longus

Origin: Upper posterior surface of ulna and middle third of posterior surface of radius and interosseous membrane.

Insertion: Over tendons of radial extensors and brachioradialis to base of 1st metacarpal and trapezium

Actions: Abducts and extends thumb at carpometacarpal (CMC)joint

Innervation: C6, C7: Posterior interosseous nerve

Daily uses: Giving a thumbs up.


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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


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