Flexor Pollicis Brevis

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Flexor Pollicis Brevis

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Origin: Flexor retinaculum and tubercle of trapezium.

Insertion: Via radial sesamoid onto the base of proximal phalanx of thumb.

Actions: Flexes MCP joint of the thumb.

Innervation: Superficial fibres: Median N (C8, T1) (Deep fibres may be innervated by ulnar N (T1))

Daily uses: Gripping on jar.


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Other muscles …


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


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

More Anatomy

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Check out strengthening exercises for the rotator cuff



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