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Flexor pollicis longus muscle

from Latin: pollex - thumb
Synonym: long thumb flexor
German: Musculus flexor pollicis longus

1 Definition

The flexor pollicis longus muscle is a muscle that belongs to the deep layer of flexors of the forearm.

2 Devolution

2.1 Origin

The origin of the muscle lies in the anterior surface of the radius and in the palmar side of the interosseous membrane of the forearm. The surface of origin can also extend to parts of the proximal ulna.

2.2 Insertion

The muscle fibers end in a flat tendon that passes below the flexor retinaculum through the carpal tunnel. It passes between the superficial head of the flexor pollicis brevis muscle and the oblique head of the adductor pollicis muscle to the thumb. The distal phalanx of the thumb (1st finger) serves as insertion.

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2.3 Varieties

In app. 40% of the people, there is an additional humeral head which has its origin at the medial epicondyle of the humerus. There also is a tendon connection to the humeral head of the flexor digitorum superficialis muscle.

3 Innervation

The innervation of the flexor pollicis longus muscle is provided by the medianus nerve, respectively, the interosseus anterior nerve from the brachial plexus (segments: C6 - C8).

4 Function

The flexor pollicis longus muscle is responsible for the flexion and opposition of the thumb. Moreover, it supports the flexion in the wrist.

Specialties: Anatomy

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