Arm Extensor Muscles
Muscle
Origin
Insertion
Nerve
Action
Notes
triceps
infraglenoid tubercle,
posterior aspect of shaft of humerus (above radial groove),
broad surface of humerus
olecranon process
radial
extends arm
anconeus
lateral epicondyle
lateral side of olecranon process
radial
abduction of lower end of ulna
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