dk test unit Holy Shit Heading under unit name ORIGIN Origin Biceps Long Head - Supraglenoid TubercleBiceps Short Head - Coracoid Process INSERTION INSERTION Both Heads - Radial Tuberosity ACTION Action Assists in flexion of the glenohumeral jointAdduction of the humerus at the glenohumeral joint (short head)Flexion of the humeroulnar jointSupination of the forearm at the radioulnar joint bottom of pageSorry, but you're not allowed to access this unit.