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Flexor pollicis brevis muscle

from Latin: pollex - thumb, flectere - flex, bend
Synonym: short thumb flexorr
German: Musculus flexor pollicis brevis

1 Definition

The flexor pollicis brevis muscle is a short, two-headed muscle that forms part of the thenar muscles of the hand.

2 Devolution

2.1 Origin

The muscle has two heads with two different surfaces of origin. The superficial head (Caput superficiale) has its origin at the distal edge of the flexor retinaculum and at the trapezium bone. The thin and profound head (Caput profundum) has its origin at the trapezium bone, and, according to some authors, also at the ulnar side of the 1st metacarpal bone.

2.2 Insertion

The tendon of the superficial head follows the tendon of the flexor pollicis longus muscle and passes over a small sesamoid bone to the radial side of th3 bade of the proximal phalanx of the thumb (1st finger). The tendon of the profound head also passes over a small sesamoid bone to the ulnar side of the base of the proximal phalanx of the thumb.

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3 Innervation

The innervation of the superficial head is provided by the medianus nerve from the brachial plexus (segments: C8, with portions from C7 and Th1). The innervation of the profound head is provided by the profound branch of the ulnar nerve (segments: C8 and Th1).

4 Function

The flexor pollicis brevis muscle is responsible for the flexion in the basal joint and the opposition and flexion of the thumb in the saddle joint.

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