THE ELBOW Muscles MUSCLES n n n Biceps

THE ELBOW: Muscles

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

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

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

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

Pronator Teres n Origin q n Insertion q n Medial epicondyle of humerus; Coronoid process of ulna Lateral surface of midshaft of radius Actions q q Pronation [Weak flexion]

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

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

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

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

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