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Deltoid
Action: Abducts shoulder (humerus); posterior deltoid- extension of the shoulder; anterior deltoid flexes shoulder
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Biceps Brachii
Action: flexes elbow (forearm); supination of forearm (radius/ulna) and shoulder (glenohumereal joint)
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Brachioradialis
Action: flexes elbow
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Upper Appendicular Muscles
InfraspinatusSupraspinatus
Flexor Capri Ulnaris
Carley Bedell and Britnia St. Pierre
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Infraspinatus
• Action: Lateral Rotation of the shoulder (humerus); horizontal adduction of humerus.
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Supraspinatus
• Action: Adduction of shoulder (humerus); stabilizes shoulder joint
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Flexor Capri Ulnaris
• Action: Flexes wrist; acts with Extensor Carpi Ulnaris to adduct wrist
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Subscapularis: medial (internal) rotation of humerus; stabilizes shoulderlateral (external) rotation of humerus
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Brachialis: flexes elbow
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Flexor carpi radialis: flexes and abducts wrist
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Teres Minor: Action: provides Lateral, external rotation of humerus.
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Triceps Brachii:Action: extends elbow and shoulder
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Extensor carpi ulnaris:Action: extends and adducts wrist, also acts with flexor carpi ulnaris to adduct wrist.
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Extensor carpi radialis (longus and brevis)action: extends and abducts wrist, and acts with flexor carpi radialis to abduct wrist.