Flexor carpi ulnaris muscle - wikipedia Flexor carpi ulnaris muscle Flexor carpi ulnaris Dorsal ( left ) and ventral ( right ) views of deep muscles of the forearm. FCU is visible in blue. Details Origin Medial epicondyle ( common flexor tendon ) and medial margin on olecranon of ulna Insertion Pisiform, hook of the hamate, base of the fifth metacarpal bone Artery Ulnar artery Nerve Muscular branches of ulnar nerve Nerve root 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 Dorlands / Elsevier m_22 / 12549030 TA A04. 6.02. 030 FMA 38465 Anatomical terms of muscle ( edit on Wikidata ) 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 1 Origin and insertion 2 Innervation 3 Tendon 4 Exercises 5 Disease 6 Additional images 7 External links Origin and insertion 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 via the pisohamate ligament and into the fifth metacarpal bone via the pisometacarpal ligament. The muscle acts to flex and adduct the wrist joint. Innervation The flexor carpi ulnaris muscle is innervated by the ulnar nerve which 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, right before the wrist, there will be 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. Exercises 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. Disease Ulnar entrapment by the aponeurosis of the two heads of the flexor carpi ulnaris ( FCU ) 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 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 Retrieved from `` https://en.wikipedia.org/w/index.php?title=Flexor_carpi_ulnaris_muscle&oldid=813612560 '' Categories : Muscles of the upper limb Forearm Hidden categories : Medicine infobox template using GraySubject or GrayPage Medicine infobox template using Dorlands parameter Pages using infobox muscle with Antagonist Pages using infobox muscle with NerveRoot Talk Contents About Wikipedia Azərbaycanca Català Deutsch Español فارسی Français Galego Hrvatski Bahasa Indonesia Italiano עברית Magyar Nederlands 日本 語 Polski Português Română Русский Slovenščina Svenska ไทย Türkçe Edit links This page was last edited on 4 December 2017, at 09 : 31. 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Question: what is the proximal attachment of the flexor carpi ulnaris in humans
Answer: humeral