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Flexor carpi ulnaris muscle

Synonym: ulnar hand flexor
German: Musculus flexor carpi ulnaris

1 Definition

The flexor carpi ulnaris muscle belongs to the superficial layer of the flexors of the forearm. It is a two-headed muscle where you can differentiate between a Caput humerale and a Caput ulnare.

2 Devolution

2.1 Origin

The Caput humerale has its origin medial to the palmaris longus muscle at the common flexor tendon at the medial epicondyle of the humerus, as well as at the antebrachial fascia.
The Caput ulnare has its origin at the medial side of the olecranon and the upper 2/3 of the dorsal ulnar edge, as well as the common intermuscular septum with the flexor digitorum superficialis muscle.

Between the two muscle heads there is a tendon below which the ulnar nerve and the posterior ulnar recurrent artery draw into distal direction.

2.2 Insertion

The muscle passes along the ulna and ends in the tendon that inserts at the pisiform bone and - over extending ligaments - at the hamate bone and the 5th metacarpal bone. Lateral to the tendon, there are the ulnar artery and nerve.

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3 Innervation

The innervation of the flexor carpi ulnaris muscle is provided by the ulnar nerve, with fibers from the C7, C8 and Th1 segments.

4 Function

As you can deduct from the name "flexor carpi ulnaris muscleî, the muscle effects a flexion of the wrist and an ulnar abduction.

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