THE ELBOW: Muscles

MUSCLES Biceps brachii Brachialis Brachioradialis Pronator teres Pronator quadratus Supinator Triceps Anconeus

Biceps Brachii Origin Insertion Actions Short = Coracoid process Long = Lip of glenoid fossa Insertion Radial tuberosity Actions Flexion of elbow Supination of forearm [Weak flexion of shoulder] Stronger with forearm supinated e.g. pull-ups

Brachialis Origin Insertion Actions Pure elbow flexor Distal half of anterior surface of humerus Insertion Coronoid process Actions Flexion of elbow Pure elbow flexor Isolated somewhat with the forearm pronated

Brachioradialis Origin Insertion Actions Anterior to elbow joint Origin Lateral ridge of distal humerus Insertion Lateral surface of distal radius near the styloid process Actions Flexion of elbow Supination of forearm Pronation of forearm Most effective as a flexor with forearm in neutral forearm position

Pronator Teres Origin Insertion Actions Medial epicondyle of humerus; Coronoid process of ulna Insertion Lateral surface of mid-shaft of radius Actions Pronation [Weak flexion]

Pronator Quadratus Origin Insertion Actions Distal, anterior end of ulna Insertion Distal, anterior end of radius Actions Pronation Removing a screw with the right hand

Supinator Origin Insertion Actions Inserting a screw with right hand Lateral epicondyle, Posterior-lateral surface of ulna Insertion Proximal, lateral surface of the radius Actions Supination Inserting a screw with right hand

Triceps Brachii Origin Insertion Actions Long = Lip of glenoid fossa Lateral = Proximal, posterior surface of humerus Medial = Distal ⅔ of posterior surface or humerus Insertion Olecranon process of ulna Actions Extension of elbow [Long head extension of shoulder and adduction of the shoulder.]

Triceps Brachii Pushing movements Throwing motions Push-ups Bench press Dips Overhead press Throwing motions

Anconeus Origin Insertion Actions Lateral epicondyle Lateral side of olecranon process Actions Extension of elbow