Muscles Of The Upper ArmsThree important muscles of the upper arms are Brachialis, Biceps Brachii, and Triceps Brachii. Below is the muscles study guide for massage therapy students.
BrachialisOrigin is distal anterior humeral shaft.Insertion is ulnar tuberosity. Action--flexes elbow. Brachialis lies deep beneath the biceps brachii and is the most effective of the arm flexors.
Biceps BrachiiOrigins are coracoid process of scapula and supraglenoid tubercle of scapula.Insertion is radial tuberosity. Actions--flexes elbow, flexes shoulder, and supinates forearm. Also known as corkscrew muscle because 2 of its actions are similar to uncorking a wine bottle.
Triceps BrachiiOrigins are posterior proximal humeral shaft, posterior distal humeral shaft, and infraglenoid tubercle of scapula.Insertion is olecranon process. Actions--extends shoulder and extends elbow. Triceps Brachii along with Serratus Anterior (located on the ribs in Chest section), is also known as the boxer's muscle because it allows you to make a straight knockout punch.
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