Attaches to the anterior surface of the radius and the interosseus membrane. Specifically, this muscle originates from the front. Flexor pollicis longus medical definition merriamwebster. Volar surface of the radius, the adjacent interosseous membrane and the medial border of the coronoid process of the. This passes through the carpal tunnel and inserts onto part of the thumb. Flexor pollicis longus muscle origin, insertion, innervation. The flexor pollicis longus originates from the anterior surface of the. Want a crash course in the origin, insertion, and innervation. Should an individual sustain a laceration as depicted, the observer can assume that the underlying tendon may be at risk for complete transection. The abductor pollicis longus lies immediately below the supinator and is sometimes united with it. This origin point of flexor pollicis longus often also includes the adjacent anterior surface of the interosseous membrane andor the lateral border of the coronoid process of ulna. Flexor pollicis longus fpl is one of the two muscles that make up the third layer of the anterior compartment of the forearm along with the flexor digitorum profundus. It is a deep muscle under abductor pollicis brevis muscle. The flexor pollicis brevis muscle is one of the intrinsic muscles of.
The flexor hallucis longus originates from the posterior surface of the body of the fibula and from the interosseous membrane of the leg. Jul 09, 2015 check out this short video on the anatomy of the flexor pollicis longus muscle, including its origin, insertion, innervation and function. Anterior surface of radius and adjacent interosseous membrane. Its tendon travels medially to the dorsal tubercle at the wrist, using the tubercle as a pulley to increase the force exerted. Origin anterior surface of radius below anterior oblique line and adjacent interosseous membrane. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
Middle third of posterior ulna below abductor pollicis longus and adjacent interosseous membrane. Flexor pollicis longus is the only muscle that flexes the interphalangeal joint of the thumb, which makes it vital for activities that require hand gripping. Flexor pollicis longus action flexion of the thumb at the carpometacarpal, metcarpophalangeal, and interphalangeal joints, assists in wrist flexion and abduction extensor digitorum origin and insertion. Like the other thenar muscles, flexor pollicis brevis acts on the thumb and flexes it at the metacarpophalangeal joint. The abductor pollicis longus apl is one of a deep extensor of the forearm and is responsible for facilitating movement and stabilisation of the thumb.
The muscle anatomy of the flexor hallucis longus lists origin, insertion, action, innervation and vascular supply. From there it extends down the arm and eventually becomes a flat tendon. The muscle anatomy of the flexor pollicis longus origin, insertion, action, innervation and vascular supply. This muscle can be easily palpated in the lower third of the. Jan 26, 2015 the flexor pollicis longus muscle is located in the lower half of the arm, from the elbow down. Flexor pollicis longus muscle wikimili, the best wikipedia. Attaches to the distal phalanx of the thumb on the palmar surface.
The flexor pollicis longus muscle has its origin at the anterior side of the radius. However, the deep head can vary in size and sometimes even be absent. It arises from the grooved anterior side of palm surface of the body of the radius, extending from. It arises from the grooved anterior side of palm surface of the body of the radius, extending from immediately below the radial tuberosity and oblique line to within a short distance of the pronator quadratus muscle. This article will discuss the anatomy and functions of the flexor pollicis brevis muscle.
Anatomy flexor pollicis longus muscle flashcards quizlet. Origin flexor retinaculum and tubercle of trapezium. This illustration represents the anatomy of the muscle and tendon origin and insertion. Flexor pollicis longus copyright american academy of manual. On further dissection we have noticed that, the accessory belly was running downwards to the medial aspect of the tendon of flexor pollicis longus muscle for its insertion. Includes the extensor pollicis longus by hyperextending the interphalangeal joint and allowing it to relax. This muscle is believed to be unique and present only in humans. Flexor pollicis longus radiology reference article. Insertion base of distal phalanx of thumb via listers tubercle dorsal tubercle of radius. It lies in the same plane as the flexor digitorum profundus. Originates from the anterior surface of the radius, and surrounding interosseous membrane. The flexor pollicis longus is a deep muscle of the anterior forearm. Sep 28, 2014 the muscle anatomy of the flexor pollicis longus origin, insertion, action, innervation and vascular supply. A proper examination is needed to determine the integrity of the tendon.
Flexor pollicis longus definition of flexor pollicis longus. It lies medial to the abductor pollicis brevis and opponens pollicis muscles, while it is lateral to adductor pollicis muscle along its course, the superficial head of the muscle passes along the radial side of the tendon of flexor pollicis longus, whereas the deep head passes deep to the same tendon. Origin middle third of posterior ulna below abductor pollicis longus and adjacent interosseous membrane. The flexor hallucis longus inserts at the distal phalanx of the first digit of the foot, also known as hallux or big toe.
Attaches to the base of the distal phalanx of the thumb. Because of its ability to pronate the forearm, the stretch position should include full forearm supination as well figure 7. Origin, insertion, functions, and exercises for the flexor pollicis longus muscle. It passes along the radial side of the tendon of the flexor pollicis longus the deeper and medial head varies in size and may be absent. Apr 08, 2020 the origin of the flexor pollicis longus is on the radius. The flexor pollicis longus or flexor pollicis longus muscle, latin. Aug 27, 2017 origin, insertion, functions, and exercises for the flexor pollicis longus muscle. Because the flexor pollicis longus flexes the elbow, wrist, and thumb joints, it is stretched by extending the elbow, wrist, and thumb. The flexor pollicis longus originates from the anterior surface of the radius and the interosseous membrane.
The flexor pollicus longus attaches at the anterior surface of the radius, the bone in your forearm that forms the bend of your elbow. Identifying the flexor pollicis longus biel, 2005 origin. It passes along the radial side of the tendon of the flexor pollicis longus. Fibers of the flexor pollicis longus end in a flattened tendon that pass. Flexor pollicis brevis the structure indicated is the flexor pollicis brevis muscle of the hand.
The tendon of the extensor pollicis longus forms the medial border of the anatomical snuffbox in the hand. Jul 31, 2019 the flexor pollicis longus muscle forms a part of the lower half of the arm which means it is located from the elbow moving downwards. The extensor pollicis longus muscle has a larger muscle belly than the epb. The flexor pollicis longus traverses the hand as a tendon. Start studying anatomy flexor pollicis longus muscle. Gantzers muscle, an accessory head of flexor pollicis longus, was present in 45% of cadavers. The deeper and medial head varies in size and may be absent. Flexor pollicis brevis is composed of superficial and deep heads. The muscles superficial head arises from the distal edge of the flexor retinaculum and the tubercle of the trapezium, the most lateral bone in the distal row of carpal bones. The innervation of the muscle is via a nerve known as the anterior interosseous and the blood supply is from the anterior interosseous artery. An occasionally present accessory long head of the flexor pollicis longus muscle is called gantzers muscle. Insertion base of proximal phalanx of thumb via radial sesamoid action flexes metacarpophalangeal joint of thumb. Nerve recurrent muscular branch of median nerve c8, t1 may also be from deep branch of ulnar nerve t1. The abductor pollicis longus is a muscle that moves the thumb in multiple directions.
The unusual suspects flexor pollicis longus muscle of the. The flexor digitorum profundus muscle originates from the ulna, which is the long bone on the pinkyside of the forearm. Origin, anterior surface of radius and adjacent interosseous membrane. Attachments, innervation and function of the flexor pollicis longus muscle. Flexor pollicis longus originates from a large area on the anterior surface of the radius, extending between the radial tuberosity superiorly and the attachment of pronator quadratus inferiorly. The flexor pollicis longus muscle is located in the lower half of the arm, from the elbow down. The function of this muscle is to facilitate thumb flexion. Possible sites and causes of nerve compression are discussed. Jul 09, 2014 the muscle anatomy of the flexor hallucis longus lists origin, insertion, action, innervation and vascular supply. Pdf anatomical diversity in flexor pollicis longus muscle. Flexor pollicis longus muscle definition of flexor pollicis. Flexor pollicis brevis is the most medial of the thenar muscles. Its tendon is present in the first extensor compartment of the wrist.
Flexes the interphalangeal joint and metacarpophalangeal joint of the thumb. It arises from the lateral part of the dorsal surface of the body of the ulna below the insertion of the anconeus, from the interosseous membrane, and from the middle third of the dorsal surface of the body of the radius. May 09, 2017 the flexor pollicis longus is a long thin muscle on the outer aspect of your forearm. This tendon travels through the carpal tunnel, the point of connection between the palm. The flexor pollicis longus originates from the anterior surface of the radius and the interosseous membrane insertion. This can sometimes appear to be flexor pollicis longus function when actually it is the relaxation of the extensor pollicis longus. The flexor pollicis longus muscle has its origin at the anterior side of the radius and the interosseous membrane, sometimes also at the medial epicondyle of. Apr 07, 2015 the flexor hallucis longus muscle is one of the three major deep muscles found in the lower back region of the leg.
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