Origin Insertion Action Essay

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Table 1.
Structure Origin Insertion Action
Deltoideus, pars clavicularis Lateral third of clavicle Deltoid tuberosity of the lateral side of the body of the humerus Flexion and medial (internal) rotation of humerus
Deltoideus, pars acromialis Acromion Deltoid tuberosity of the lateral side of the body of the humerus Abduction of humerus
Deltoideus, pars spinalis Scapula spine Deltoid tuberosity of the lateral side of the body of the humerus Extension and lateral rotation of humerus
Supraspinatus All of the supraspinatus fossa The greater tubercle of the humerus Assists deltoid in abducting the arm
Infraspinatus Infraspinatus fossa on posterior surface of the scapula Greater tubercle of the humerus Laterally rotates the upper limb; stabilizes
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Teres minor Lateral border of the scapula Greater tuberosity of the humerus Lateral (external) rotation of the humerus
Teres major Inferior angle of the scapula Intertubercular groove of humerus Extension, adduction, and medial (internal) rotation of the humerus
Coracobrachialis Coracoid process of the scapula Medial surface and border of the body of the humerus Adduction and flexion of the humerus
Subscapularis Subscapular fossa Lesser tubercle of the humerus Medial (internal) rotation of the head of the humerus
Biceps brachii, caput longum Coracoid process of the scapula Radial tuberosity Flexes and supinates the elbow
Biceps brachii, caput breve Coracoid process of the scapula Radial tuberosity Flexes and supinates at the
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Triceps brachii, caput mediale Posterior surface of the body of the humerus, below the groove of the radial nerve Olecranon of the ulna Extends the forearm at the elbow
Brachialis Anterior distal half of the humerus Ulnar tuberosity and anterior surface of the coronoid process Flexes the forearm at the elbow
Pronator teres Medial epicondyle of humerus, coronoid process of ulna Lateral surface of radius Pronates and flexes forearm
Brachioradialis Ridge superior to lateral epicondyle of the humerus and the lateral intermuscular septum Lateral side of the base of the styloid process of the radius Flexes at the forearm
Flexor carpi radialis Medial epicondyle of the humerus Base of the 2nd metacarpal and base of 3rd metacarpal Flexion and abduction (radial) of the hand
Flexor pollicis longus Anterior surface of radius and interosseous membrane Base of distal phalanx of thumb (pollex) Flexes distal phalanx of the thumb (pollex)
Flexor digitorum superficialis Humeral head: medial epicondyle; ulnar head: coronoid process: radial head: below the radial tuberosity Middle phalanx of digits 2-5 Flexes wrist, flexes middle and proximal phalanges of digits 2-5
Palmaris longus Medial epicondyle of humerus Palmar aponeurosis and flexor retinaculum Flexes hand, tenses flexor

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