Muscles on the Anterior Surface of the Arm

Muscles on the Anterior Surface of the Arm - lateral side...

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Muscles on the Anterior Surface of the Arm MUSCLE FROM TO ACTION long head - upper margin of glenoid fossa short head - apex of coracoid process of scapula bicipital tuberosity of radius Unless prevented by the action of neutralizers, acts to simultaneously flex and supinate the elbow; the greatest muscle action (as evidenced by measures of the electrical activity in the muscles [electromyography - EMG]) is when the elbow is supinated; when the elbow is pronated biceps brachii is inactive unless an external resistance is applied Brachialis anterior surface of lower half of humerus anterior surface of coronoid process of ulna Acts in elbow flexion; it is a spurt muscle and therefore has a greater rotary component Brachioradialis upper 2/3 of lateral supra condylar ridge of humerus
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Unformatted text preview: lateral side of base of styloid process of radius Acts in elbow flexion; is more active in a semi-pronated position than in a supine position; it neither supinates nor pronates the elbow unless the movement is strongly resisted; it is a shunt muscle and is most active in stabilization of the elbow Pronator Teres medial epicondyle of humerus and medial side of coronoid process of ulna lateral surface of radius near the middle Acts to pronate the elbow; it also assists in flexing versus resistance; the elbow joint angle does not influence pronation activity Pronator Quadratus anterior surface of lower ¼ of ulna (wrist end) anterior surface of lower ¼ of radius (wrist end) acts only in pronation of the elbow...
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This note was uploaded on 09/25/2010 for the course EXS 31757 taught by Professor Brennan during the Spring '10 term at Oakland University.

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Muscles on the Anterior Surface of the Arm - lateral side...

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