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Deep head of flexor pollicis ...

Other Terms: Caput profundum (Musculus flexor pollicis brevis), Caput profundum musculus flexoris pollicis brevis

Muscle parts

Superficial head; Deep head

Latin name

Musculus flexor pollicis brevis

Latin muscle parts

Caput superficiale; Caput profundum

Group

Hand muscle – thenar group

Etymology

In English this muscle’s name is the short muscle that bends the thumb. The word flexor comes from the Latin flectere meaning “to bend.” The Latin pollex meaning “thumb” arises from the Latin polleo meaning “to be strong,” as the thumb was the strongest of the fingers. Brevis is the Latin term meaning “short.” This is being used as a comparative reference to a longer muscle that does the same thing.

Origin

Distal border of the flexor retinaculum and the tubercle of the trapezium bone (superficial head) and the anterior surface of the trapezoid and capitate bones (deep head).

Insertion

Base of proximal phalanx of thumb on radial side (the tendon contains a sesamoid bone).

Action

Flexes the metacarpophalangeal joint of the thumb.

Nerve supply

Median nerve (C8 and T1) to superficial head; ulnar nerve to deep head (C8 and T1)

Blood supply

From proximal to distal the muscle is supplied by the superficial palmar branch of the radial artery, the princeps pollicis artery, and the radialis indicis artery.

Latin

Caput profundum musculus flexoris pollicis brevis

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