A Flex the elbow (humeroulnar joint)Supinate the forearm (radioulnar joints)Flex the shoulder (glenohumeral joint)O Short head:Coracoid process of scapulaLong head:Supraglenoid tubercle of scapulaI Tuberosity of the radius and aponeurosis of the biceps brachii Flexion and supination of the forearm is one of the main functions Biceps braci