Muscles of the Arm and Forearm- Origin, Insertion, and Action

Muscles of the Arm and Forearm- Origin, Insertion, and Action Biceps brachii - >>Origin: Long head: superior margin of glenoid fossa of scapula; short head: coracoid process of scapula. Insertion: radial tuberosity of radius; fascia of medial forearm via bicipital aponeurosis. Action: flexion and supination of forearm; flexion of arm. Brachialis - >>Origin: anterior surface of humerus. Insertion: coronoid process of ulna. Action: flexion of forearm. Coracobrachialis - >>Origin: coracoid process of scapula. Insertion: medial surface of humerus. Action: flexion and adduction of arm. Triceps brachii - >>Origin: Long head: inferior margin of glenoid fossa of scapula; Lateral head: posterior surface of humerus; Medial head: posterior surface of humerus, inferior to origin of lateral head. Insertion: olecranon process of ulna. Action: extension of forearm; long head extends and adducts arm. Pronator teres - >>Origin: medial epicondyle of humerus; coronoid process of ulna. Insertion: lateral surface of radius. Action: pronation and flexion of the forearm. Flexor carpi radialis - >>Origin: medial epicondyle of humerus. Insertion: base of metacarpal of the second digit...