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Flexor Pollicis Brevis
Muscles goes here
O/I goes here
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.
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
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