No ligament of Struthers was found. Flexor pollicis longus muscle: want to learn more about it? Flexor pollicis longus is quite variable and can occasionally be blended with the flexor digitorum superficialis, flexor digitorum profundus or pronator teres. Page 1 of 1 - About 10 essays. Read more. Flexor Pollicis Longus:This muscle lies laterally to the FDP. Origin. We need you! Abductor pollicis longus originates from the posterior surface of the proximal half of the radius, ulna and intervening interosseous membrane. Flexor pollicis longus muscle (Musculus flexor pollicis longus) Flexor pollicis longus, as its name suggests, is a long muscle of the forearm.It belongs to the deep flexors of the forearm, along with flexor digitorum profundus and pronator quadratus.Since it lies in the forearm but inserts in the hand, flexor pollicis longus is also classified as an extrinsic muscle of the hand. The palmaris longus (or palmaris longus muscle, latin: musculus palmaris longus) is a long, flat, superficial muscle of the forearm that belongs to the anterior muscle group and lies in the first layer.. [5][6], Slips may connect with flexor digitorum superficialis muscle, flexor digitorum profundus muscle (resulting in the Linburg-Comstock syndrome),[7] or the pronator teres muscle. gibbons) and Old World monkeys (e.g. This may sometimes leads to a reduction in the muscular power of the hand, pain and numbness in the territory of median nerve in the hand and ape-thumb like deformity. Various appearance of the extrinsic vascular supply to the flexor pollicis longus tendon as observed in five dissection specimens. Cross-section through the middle of the forearm. In the wrist, the tendinous sheath of flexor pollicis longus passes underneath the flexor retinaculum between opponens pollicis and the oblique head of adductor pollicis muscle. N/A. FLEXOR POLLICIS LONGUS. Questions. Origin: [4], The fibers end in a flattened tendon, which passes beneath the flexor retinaculum of the hand through the carpal tunnel. In the forearm, flexor pollicis longus is located lateral to flexor digitorum profundus. [8], Lesser apes (i.e. Flexor pollicis longus - Innervation. The flexor pollicis longus muscle is located in the lower half of the arm, from the elbow down. Flexion of the thumb carpometacarpal, metacarpophalangeal, and interphalangeal joints, Flexion of the wrist, Abduction of the wrist. Jump to: navigation, search. Possible Substitutions: Includes the extensor pollicis longus by hyperextending the interphalangeal joint and allowing it to relax. Flexor pollicis longus receives nervous supply from the anterior interosseous branch of median nerve, derived from spinal roots C7 and C8. It arises from the grooved anterior (side of palm) surface of the body of the radius,[2] extending from immediately below the radial tuberosity and oblique line to within a short distance of the pronator quadratus muscle. Gray's Anatomy (41tst ed.). Transverse section across the wrist and digits. It is an anatomical part that is unique to humans. Gantzer's muscle, an accessory head of flexor pollicis longus, was present in 45% of cadavers. Flexor Pollicis Longus terminates at the tip of the thumb. In conclusion, for needle insertion into the flexor pollicis longus, ultrasonography allows safer and more accurate approach. [2] An occasionally present accessory long head of the flexor pollicis longus muscle is called 'Ganzer's muscle'. In some individuals, this tendon tend to act more like a ligament, which restricts extension of the interphalangeal joint of the thumb. Philadelphia, PA: Lippincott Williams & Wilkins. It arises also from the adjacent part of the interosseous membrane of the forearm, and generally by a fleshy slip from the medial border of the coronoid process of the ulna. The flexor pollicis longus (FPL) is a long muscle located at the deep layer with flexor digitorum profundus and pronator quadratus in the anterior compartment of the forearm. The mucous sheaths of the tendons on the front of the wrist and digits. Flexor pollicis longus also flexes the thumb at the metacarpophalangeal joint and contributes to the flexion of the wrist. In a small part of the population the flexor pollicis longus can even be absent. Possible sites and causes of nerve compression are discussed. Grounded on academic literature and research, validated by experts, and trusted by more than 1 million users. Gordana Sendic Insertion: Distal phalanx of medial 4 digits (through FDS tunnel). The flexor pollicis longus (/ˈflɛksər ˈpɒlɪsɪs ˈlɒŋɡəs/; FPL, Latin flexor, bender; pollicis, of the thumb; longus, long) is a muscle in the forearm and hand that flexes the thumb. Flexor tendon anatomy can be best understood by individual structures or zones of the hand. All rights reserved. The flexor pollicis longus is located laterally to the FDP and covers the anterior aspect of the radius distal to the attachment of supinator muscle. It is an anatomical part that is unique to humans. It passes along the radial side of the tendon of the flexor pollicis longus.. The main function of the flexor pollicis longus is flexion of the thumb at the interphalangeal joint. This article incorporates text in the public domain from page 449 of the 20th edition of Gray's Anatomy (1918), This gallery of anatomic features needs cleanup to abide by the, Galleries containing indiscriminate images of the article subject are discouraged, "CHAPTER 56 - Osteotomy for Extra-articular Malunion of the Distal Radius", "The evolutionary history of the hominin hand since the last common ancestor of Pan and Homo", https://en.wikipedia.org/w/index.php?title=Flexor_pollicis_longus_muscle&oldid=986981540, Wikipedia articles incorporating text from the 20th edition of Gray's Anatomy (1918), Creative Commons Attribution-ShareAlike License, The middle 1/2 of the anterior surface of the, This page was last edited on 4 November 2020, at 03:24. Metacarpophalangeal and interphalangeal joint 1; Median nerve (anterior interosseous nerve C7, C8), Medial part: anterior interosseous artery (ulnar artery); lateral part: radial artery. Have you ever given someone a 'thumbs up'? Its secondary action is to help flex the wrist when the thumb is in a flexed state. The site of origin is located just inferior to the insertion of the anconeus muscle.From here, the muscle courses inferolaterally towards the radial side of the hand, becoming more superficial as it enters the distal third of the forearm. ... is then placed in a figure-of-eight fashion from the radial aspect of the APL tendon down to the FCR tendon near its insertion at the index metacarpal base. Extensor Carpi Radialis Brevis Insertion Extensor Carpi Radialis Flexor Pollicis Longus Insertion Flexor Digitorum Profundus Lateral Supracondylar Ridge Of Humerus. Origin: Originates from the anterior surface of the radius, and surrounding interosseous membrane. Origin and insertion. “I would honestly say that Kenhub cut my study time in half.” Actions include agonists and antagonists for each movement. The muscles of the left hand. Transverse section across distal ends of radius and ulna. This origin point of flexor pollicis longus often also includes the adjacent anterior surface of the interosseous membrane and/or the lateral border of the coronoid process of ulna. The Vascularization of the Human Flexor Pollicis Longus Tendon By GOran Lundbore Fig. Kim Bengochea, Regis University, Denver, Author: It may cause compression of the anterior interosseous nerve. Sometimes a small slip of the muscle originates from the medial surface of the coronoid process of ulna or the medial epicondyle of humerus. 1996 Jan;21(1):152-3. doi: 10.1016/S0363-5023(96)80172-9. The flexor pollicis longus muscle is located in the lower half of the arm, from the elbow down. The results of this study demonstrate that the safest and most appropriate needle insertion point to the flexor pollicis longus is the middle of the forearm within about 0.8 cm from the most prominent point of the radius. Flexor pollicis longus receives dual blood supply. Flexor pollicis longus - Insertion. An occasionally present accessory long head of the flexor pollicis longus muscle is called 'Gantzer's muscle'. Flexor pollicis longus muscle (Musculus flexor pollicis longus) - Yousun Koh. Muscle anatomy of the flexor pollicis longus includes origin, insertion, action, innervation and vascular supply. The flexor pollicis longus originates from the anterior surface of the radius and the interosseous membrane.. Insertion. The abductor pollicis longus is a long, thin muscle of the forearm that not only allows you to give a 'thumbs up' (a motion called thumb extension) but also allows you to move your thumb so you can let go of an object that you are grasping (a motion called thumb abduction). Nerve supply: Median nerve (anterior interosseous branch). Abductor Pollicis Longus to Flexor Carpi Radialis Tenodesis Suspensionplasty. Read more. It is most commonly used to flex and control the thumb and is only found in humans — no other primates have the muscle. In orangutans there is a tendon similar in insertion and function to the FPL in humans, but which has an intrinsic origin on the oblique head of the adductor pollicis. It lies in the same plane as the flexor digitorum profundus. Learning anatomy is a massive undertaking, and we're here to help you pass with flying colours.