The flexor carpi ulnaris muscle (or FCU) is a muscle of the human forearm that acts to flex and adduct (medial deviation) the hand.
Contents
1Structure
1.1Nerve supply
1.2Tendon
2Function
3Clinical significance
4Additional images
5External links
Structure
Flexor carpi ulnaris muscle arises by two heads, humeral and ulnar, connected by a tendinous arch beneath which the ulnar nerve and artery pass.
The humeral head arises from the medial epicondyle of the humerus by the common flexor tendon.
The ulnar head arises from the medial margin of the olecranon of the ulna and from the upper two-thirds of the dorsal border of the ulna by an aponeurosis.
Its insertion is into the pisiform bone, into the hamate bone by the pisohamate ligament and into the fifth metacarpal bone by the pisometacarpal ligament.
The muscle acts to flex and adduct the wrist joint.
Nerve supply
The flexor carpi ulnaris muscle is innervated by the ulnar nerve that has its roots in the C8 and T1 spinal nerves.
Tendon
The tendon of flexor carpi ulnaris can be seen on the anterior of the distal forearm. On a person's distal forearm, just before the wrist, there are either two or three tendons. The tendon of the flexor carpi ulnaris is the most medial (closest to the little finger) of these. The most lateral one is the tendon of flexor carpi radialis muscle, and the middle one, not always present, is the tendon of palmaris longus.
Function
The muscle, like all flexors of the forearm, can be strengthened by exercises that resist its flexion. A wrist roller can 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]
Clinical significance
Ulnar entrapment by the aponeurosis of the two heads of the flexor carpi ulnaris muscle may cause cubital tunnel syndrome.
Additional images
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
External links
Illustration: upper-body/flexor-carpi-ulnaris from The Department of Radiology at the University of Washington
v
t
e
Muscles of the arm
Shoulder
deltoid
rotator cuff
supraspinatus
infraspinatus
teres minor
subscapularis
teres major
fascia:
deltoid fascia
supraspinous fascia
infraspinous fascia
Arm (compartments)
anterior
coracobrachialis
biceps
brachialis
posterior
triceps brachii
anconeus
articularis cubiti
fascia
axillary sheath
axillary fascia
brachial fascia
intermuscular septa
lateral
medial
other
spaces
quadrangular space
triangular space
triangular interval
Forearm
anterior
superficial:
pronator teres
palmaris longus
flexor carpi radialis
flexor carpi ulnaris
flexor digitorum superficialis
deep:
pronator quadratus
flexor digitorum profundus
flexor pollicis longus
posterior
superficial:
mobile wad
brachioradialis
extensor carpi radialis longus and brevis
extensor digitorum
extensor digiti minimi
extensor carpi ulnaris
deep:
supinator
anatomical snuff box
abductor pollicis longus
extensor pollicis brevis
extensor pollicis longus
extensor indicis
fascia
bicipital aponeurosis
common tendons
extensor
flexor
antebrachial fascia
other
cubital tunnel
Hand
lateral volar
thenar
opponens pollicis
flexor pollicis brevis
abductor pollicis brevis
adductor pollicis
medial volar
hypothenar
opponens digiti minimi
flexor digiti minimi brevis
abductor digiti minimi
palmaris brevis
intermediate
lumbrical
interossei
dorsal
palmar
fascia
posterior:
extensor retinaculum
extensor expansion
anterior:
flexor retinaculum
palmar aponeurosis
Authority control
TA98: A04.6.02.030
UpToDate Contents
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…especially distal radial fractures The pisiform is a sesamoid bone contained within the flexorcarpiulnaris (FCU) tendon Ossification occurs between 7 and 10 years of age, and is complete by age 12 …
…superficialis, and flexor carpi ulnaris muscles. The common flexor tendon is superficial, and shorter than the common extensor tendon, and more of the musculotendinous transition is visible with ultrasound. Deep …
… fibers of the flexor carpi ulnaris muscle more distally. The nerve then pierces the aponeurosis lining the deep heads of the flexorcarpiulnaris and runs between the tendons and muscle planes of the medial …
… the pisiform is compressed between the flexorcarpiulnaris tendon and the triquetrum.… intersection of the muscle bellies of the abductor pollicis longus and extensor pollicis brevis, where they cross over the extensor carpi radialis longus and the extensor carpi radialis brevis…
… the accompanying graphic The extensor carpiulnaris (ECU) is a long thin muscle originating from the lateral epicondyle of… limit of the flexor retinaculum (transverse carpal ligament) . The palmaris longus tendon is present in 80 percent of individuals and runs parallel and ulnar to the flexorcarpi radialis…
English Journal
The effect of high-fat diet on the morphological properties of the forelimb musculature in hypertrophic myostatin null mice.
Elashry MI, Eldaey A, Glenske K, Matsakas A, Wenisch S, Arnhold S, Patel K.
Journal of anatomy. 2019 Jun;().
Obesity is a worldwide nutritional disorder affecting body performance, including skeletal muscle. Inhibition of myostatin not only increases the muscle mass but also it reduces body fat accumulation. We examined the effect of high-fat diet on the phenotypic properties of forelimb muscles from myost
The anterior or volar compartment of the forearm contains eight muscles: five belong to the superficial group (pronator teres, flexor carpi radialis, palmaris longus, flexor digitorum superficialis and flexor carpi ulnaris), and three to the deep group (flexor digitorum profundus, flexor pollicis lo
九州共立大学研究紀要 = Study journal of Kyushu Kyoritsu University 7(1), 45-50, 2016
… The purpose of this study was to investigate the differences between the throwing side and nonthrowingside in forearm muscle thickness of baseball pitchers. …
… For the muscles controlling radial deviation, the flexorcarpi radialis and extensor carpi radialis longus were selected. … For the muscles responsible for ulnar deviation, the flexorcarpiulnaris and extensor carpiulnaris were selected. … These muscles were represented with muscle spring models. …
Flexor carpi ulnaris pain & trigger points The flexor carpi ulnaris is a forearm muscle and can induce pain in the wrist if it gets overworked or develops trigger points. On this page you will learn about this muscles’ functions, insertions ...
A tutorial on the position, actions, attachments and innervation of the Flexor Carpi Ulnaris muscle with the aid of detailed anatomical illustrations. Click and start learning now! ... Attachments of the Flexor Carpi Ulnaris Muscle: Origin ...
The anterior muscles of the forearm consist of three layers, the superficial, intermediate, and deep flexors. All three layers are located in the flexor compartment. Among the superficial muscles is the flexor carpi ulnaris.