Flexes And Adducts The Hand

Flexor carpi ulnaris
Dorsal (left) and ventral (right) views of deep muscles of the left forearm. The flexor carpi ulnaris muscle is in blue.
Details
Origin	Medial epicondyle (mutual flexor tendon) and medial margin on olecranon of ulna
Insertion	Pisiform, hook of the hamate, base of the fifth metacarpal bone (Volar Aspect)
Artery	Ulnar artery
Nerve	Muscular branches of ulnar nervus (from C8 and T1)
Actions	Flexion and adduction of wrist
Antagonist	Extensor carpi radialis brevis muscle and extensor carpi radialis longus muscle
Identifiers
Latin	Musculus flexor carpi ulnaris
TA98	A04.6.02.030
TA2	2483
FMA	38465
Anatomical terms of muscle [edit on Wikidata]

The flexor carpi ulnaris (FCU) is a muscle of the forearm that flexes and adducts at the wrist joint.

Structure [edit]

Origin [edit]

The flexor carpi ulnaris has two heads; a humeral head and ulnar head. The humeral head originates from the medial epicondyle of the humerus via the common flexor tendon. The ulnar head originates from the medial margin of the olecranon of the ulnar and the upper two-thirds of the dorsal border of the ulnar by an aponeurosis. Betwixt the two heads passes the ulnar nerve and ulnar artery.

Insertion [edit]

The flexor carpi ulnaris inserts onto the pisiform, hook of the hamate (via the pisohamate ligament) and the anterior surface of the base of operations of the fifth metacarpal (via the pisometacarpal ligament).

Action [edit]

The flexor carpi ulnaris flexes and adducts at the wrist articulation.

Innervation [edit]

The flexor carpi ulnaris is innervated by the ulnar nerve. The corresponding spinal nerves are C8 and T1.

Tendon [edit]

The tendon of flexor carpi ulnaris tin can be seen on the anterior surface of the distal forearm. On a person'due south distal forearm, but before the wrist, there are either 2 or three tendons. The tendon of the flexor carpi ulnaris is the nearly medial (closest to the little finger) of these. The most lateral one is the tendon of flexor carpi radialis muscle, and the eye one, not e'er present, is the tendon of palmaris longus.

Part [edit]

The muscle, like all flexors of the forearm, can be strengthened by exercises that resist its flexion. A wrist roller tin be used and wrist curls with dumbbells can also be performed. These exercises are used to prevent injury to the ulnar collateral ligament of elbow joint.^{[ citation needed ]}

Variability [edit]

The musculus can exist doubled every bit accessory flexor carpi ulnaris muscle and is often accompanied by concomitant variants.^[1]

Clinical significance [edit]

Ulnar entrapment by the aponeurosis of the ii heads of the flexor carpi ulnaris muscle may cause cubital tunnel syndrome.

Tendon of flexor carpi ulnaris can be used for tendon transfer.^[1]

Additional images [edit]

Bones of left forearm. Posterior aspect.
Bones of the left hand. Volar surface showing its insertion into the pisiform bone and then via ligaments into the hamate bone and 5th metacarpal bone, acting to flex and adduct the wrist joint.
Cross-section through the middle of the forearm.
Flexor carpi ulnaris muscle

References [edit]

^ ^a ^b Kunc, Vojtech; Stulpa, Michal; Feigl, Georg; Kachlik, David (2019-05-29). "Accessory flexor carpi ulnaris muscle with associated anterior interosseous artery variation: case report with the definition of a new type and review of concomitant variants". Surgical and Radiologic Anatomy. 41 (11): 1315–1318. doi:10.1007/s00276-019-02261-four. ISSN 0930-1038. PMID 31144008. S2CID 169032218.

External links [edit]

Analogy: upper-trunk/flexor-carpi-ulnaris from The Department of Radiology at the Academy of Washington