Flexor pollicis longus of the thumb

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Congenital absence of flexor pollicis longus with or without associated anomalies of thenar muscles and thumb is of rare occurrence. Inability to flex the interphalangeal joint of the thumb and absent dorsal wrinkles and flexion creases of the thumb are important clues to the diagnosis. Routine radiography and cross-sectional imaging help to confirm and document the condition.

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The flexor pollicis longus is a muscle of the anterior forearm and hand. Because of its medial to lateral direction from proximal to distal, it can also weakly pronate the forearm at the radioulnar joints. Figure 4.

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A mathematical model was developed to calculate internal forces in the thumb. The solution was indeterminate, since the number of unknown forces exceeded the equations available in the static force analysis. To resolve the problem, the muscle forces were obtained in conjunction with quantitative electromyographic data.

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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. It passes through the carpal tunnel. It is one of the extrinsic muscles of the hand.

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The thumb has a long flexor, a long abductor, and two extensors, a long one and a short one. The long flexor, flexor pollicis longus, lies deep in the forearm. It arises from the anterior surface of the radius, and from the interosseous membrane.

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Correspondence Address: Dr. Primary tendon repairs are often difficult in patients with delayed presentation. Tendons are contracted and shortened with extensive scarring occurring along the path of the tendon.

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Isolated loss of flexor pollicis longus function after plating of the radius. Reprint requests. A patient presented with an open midshaft radius and ulna fracture which was treated with debridement and open reduction and internal fixation using the LC-DCP technique.

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A rare differential diagnosis of thumb flexion deficiency is an isolated flexor pollicis longus FPL nerve fascicle lesion. We present a year-old otherwise healthy female patient who developed a weak thumb-to-index pinch and deficient right thumb flexion following the removal of osteosynthesis plates after a forearm fracture. Clinically,the flexor pollicis longus function was absent, yet index flexion and sensibility were unimpaired. Tendon rupture was excluded using a tenodesis test and the electro-physiological result of isolated interosseus nerve fascicle lesion was confirmed intraoperatively by inspection and electrostimulation.

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The flexor pollicis longus or flexor pollicis longus musclelatin: musculus flexor pollicis longus is a muscle of the forearm that belongs to the anterior muscle group and is situated in the third or deep layer. The flexor pollicis longus originates from the anterior surface of the radius and the interosseous membrane. Fibers of the flexor pollicis longus end in a flattened tendon that pass through the carpal channel and reach the thumb.

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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. It arises from the grooved anterior side of palm surface of the body of the radiusextending from immediately below the radial tuberosity and oblique line to within a short distance of the pronator quadratus muscle.

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