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 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. It lies in the same plane as the flexor digitorum profundus. This muscle is unique to humans, being either rudimentary or absent in other primates. [1]
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The flexor pollicis longus is a muscle within the deep compartment of the anterior forearm. Attachments: Originates from the anterior surface of the radius and surrounding interosseous membrane. The tendon passes through the carpal tunnel and attaches to the base of the distal phalanx of the thumb. The FPL mainly flexes interphalangeal joint of the distal phalanx of the thumb. It also serves as accessory flexors of the metacarpophalangeal of the proximal phalanx and carpometacarpal joints of the first metacarpal. It may also assist in wrist joint flexion. The flexor pollicis longus muscle is one of the muscles of the deep part of the anterior compartment of the forearm. It is a unipennate type of skeletal muscle. At the wrist, its tendon travels deep to the flexor retinaculum of hand, where it passes through the tendinous sheath of flexor pollicis longus. Structure and Function The FPL muscle is the primary flexor of the thumb, providing flexion at its metacarpophalangeal (MCP) joint and interphalangeal (IP) joint. Additionally, FPL has minor contributions in radial wrist deviation and wrist flexion. [1]
Flexor pollicis longus originates on 1. the middle half of the *anterior* radius (extending from
Flexor Pollicis Longus. Origin. Anterior surface of radius and adjacent interosseous membrane. Insertion. Base of distal phalanx of thumb. Action. Flexes phalanges of 1st digit (thumb) Innervation. Anterior interosseous nerve (C8, T1) frequently the flexor pollicis longus muscle arises from the lower part and slip of coronoid process of ulna by a rounded bundle of muscular fibers and even medial epicondyle of humerus insertion : volar surface of the distal 1 st phalanx (thumb) innervation: anterior interosseous nerve action : flexion of 1 st interphalangeal joint The flexor pollicis longus muscle inserts on the thumb at the distal phalanx. The flexor digitorum profundus muscle originates from the proximal end of the radius and ulnar. The flexor digitorum profundus muscle descends to attach at the base of distal phalanx of the second, third, fourth, and fifth digits. A square shaped muscle found deep to the tendons of the flexor digitorum profundus and flexor pollicis longus. Attachments: Originates from the anterior surface of the ulna and attaches to the anterior surface of the radius. Actions: Pronates the forearm. Innervation: Median nerve (anterior interosseous branch).
Abductor Pollicis Longus Origin, Insertion, Nerve Supply & Action » How To Relief
Flexor pollicis longus is used for tasks requiring gripping of the hand such as grasping or lifting an object. Any injury to the muscle will cause a decrease in the flexion ability of the thumb which can be a frustrating and debilitating injury. Flexor pollicis longus is susceptible to muscle tears, muscle strain, tendonitis, and rupture. Check out this short video on the anatomy of the flexor pollicis longus muscle, including its origin, insertion, innervation and function. Take a closer look.
flexor pollicis brevis. abducting and flexing the thumb. first metacarpal, carpal bones. first proximal phalanx. flexor pollicis longus. flexing the thumb. first distal phalanx. radius, interosseous membrane. flexor retinaculum of the wrist (a tendinous sheath) no actions - fibrous band over carpal bones, forms carpal tunnel. n/a. n/a. lumbricals The flexor pollicis longus (Latin: musculus flexor pollicis longus) is a long muscle of the upper limb that stretches between the radius and the distal phalanx of the thumb. It is one of the deep muscles of the forearm that is located in the anterior compartment. Together with the flexor digitorum profundus, this deep flexor of the forearm lies in the third muscle layer.
flexor pollicis longus origin and insertion Google Search Wrist anatomy, Muscle anatomy, Anatomy
The Flexor pollicis longus is situated on the radial side of the forearm, lying in the same plane as the preceding. It arises from the grooved volar surface of the body of the radius, extending from immediately below the tuberosity and oblique line to within a short distance of the Pronator quadratus. It arises also from the adjacent part of. The flexor pollicis longus is one of three muscles in the deep compartment of the anterior muscles of the forearm. The two other muscles are the flexor digitorum profundus and the pronator quadratus. The name in Latin translates as the long flexor of the thumb.
