Muscles thumb

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The purpose of this study was to measure the moment arms of four extrinsic muscles flexor pollicis longus, extensor pollicis longus, extensor pollicis brevis, and abductor pollicis longus and four intrinsic muscles flexor pollicis brevis, abductor pollicis brevis, adductor pollicis, and opponents pollicis of the thumb at the interphalangeal, the metacarpophalangeal, and the carpometacarpal joints in the same cadaver specimens and to examine the specific role of each muscle. Measurements were made on seven fresh frozen cadaver hands. Moment arms were computed using the slope of the tendon excursion joint angle relationship.

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The hand is distal to the forearm, and its skeletal framework includes the carpus, or wrist. In lay usage, however, the word "wrist" is used for the distal end of the forearm, a wrist-watch being worn over the lower ends of the radius and ulna. The position of the hand at rest is shown in figure

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Muscles are groups of cells in the body that have the ability to contract and relax. There are different types of muscle, and some are controlled automatically by the autonomic nervous system. Other muscles, like the skeletal muscle that moves the arm, is controlled by the somatic or voluntary nervous system.

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Thenar muscles are part of the intrinsic muscles of hand that contributes to the finer movements of the thumb including the opposition. Their insertions are primarily on the base of the proximal phalanx of thumb, except for the opponens, which inserts on the first metacarpal. Blood Supply : Superficial palmar branches of Radial arterywhich arises from the radial artery at the level of the radial styloid.

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OBJECTIVE: The purpose of this study is to quantify the electrical activity of the thumb muscles responsible for the production of force in different directions of thumb movement. DESIGN: The isometric forces and electromyographic activity generated by seven thumb muscles were measured on five normal healthy test subjects. Presently available electromyographic studies of the thumb muscles provide only limited information.

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The hand is an intricately complex structure whose muscles have evolved to permit an unequalled array of movements. More than 30 individual muscles in the hand and forearm work together to achieve these diverse movements. These muscles provide the hands with unsurpassed flexibility, extremely precise control, and gripping strength that are necessary for activities ranging from writing and typing to producing music and gripping a ball in sports.

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In this article, we shall be looking at the anatomy of the intrinsic muscles of the hand. The thenar muscles are three short muscles located at the base of the thumb. The muscle bellies produce a bulge, known as the thenar eminence.

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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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The muscles of the thumb are nine skeletal muscles located in the hand and forearm. The muscles allow for flexionextensionadductionabduction and opposition of the thumb. The muscles acting on the thumb can be divided into two groups: The extrinsic hand muscles, with their muscle bellies located in the forearm, and the intrinsic hand muscles, with their muscles bellies located in the hand proper.

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One of them lies by itself, and three lie close together. Adductor pollicis has two heads, a transverse head and an oblique head. The transverse head arises from the third metacarpal.

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