| Muscles Acting On The Elbow |
| |
Origin |
Insertion |
Innervation |
Action |
| Biceps brachii (long head) |
Supraglenoid tubercle of scapula & glenoid labrum |
Posterior part of radial tuberosity & bicipital aponeurosis |
Musculocutaneous nerve (C5 – C7) |
Supinates forearm, flexes elbow, weakly flexes shoulder |
| Biceps brachii (short head) |
Coracoid process of scapula with coracobrachialis |
Posterior part of radial tuberosity & bicipital aponeurosis |
Musculocutaneous nerve (C5 – C7) |
Supinates forearm, flexes elbow, weakly flexes shoulder |
| Brachialis |
Lower ½ of anterior surface of humerus |
Coronoid process & tuberosity of ulna |
Musculocutaneous nerve (C5 – C6), radial nerve (C7) |
Flexes elbow |
| Brachioradialis |
Upper 2/3 of lateral supracondylar ridge of humerus |
Lateral side of radius above styloid process |
Radial nerve (C5 – C6) |
Flexes elbow |
| Pronator teres |
Humeral head: Medial epicondyle via common flexor tendon. Ulnar head: medial part of coronoid process |
Middle of lateral surface of radius |
Median nerve (C6 – C7) |
Pronates forearm, flexes elbow |
| Triceps brachii (long head) |
Infraglenoid tubercle of scapula |
Posterior part of upper surface of olecranon process of ulna & posterior capsule |
Radial nerve (C7 – C8) |
Extends shoulder & elbow |
| Triceps brachii (lateral head) |
Upper half posterior humerus (linear origin) |
Posterior part of upper surface of olecranon process of ulna & posterior capsule |
Radial nerve (C7 – C8) |
Extends the elbow |
| Triceps brachii (medial head) |
Lies deep on lower half of posterior humerus inferomedial to spiral groove & both intermuscular septa |
Posterior part of upper surface of olecranon process of ulna & posterior capsule |
Radial nerve (C7 – C8) |
Elbow the elbow |
| Anconeus |
Posterior surface of lateral epicondyle of humerus |
Lateral surface of olecranon, upper ¼ of posterior surface of ulna |
Radial nerve (C6 – C8) |
Extends elbow |
| Pronator quadratus |
Lower ¼ of anterior surface of ulna |
Lower ¼ of anterior surface of radius |
Anterior interosseous branch of median nerve (C7 – C8) |
Pronates forearm |
| Supinator |
Inferior aspect of lateral epicondyle, LCL & annular ligament |
Posterior, lateral & anterior aspects of upper 1/3 of radius |
Posterior interosseous nerve (C6 – C7) |
Supinates forearm |
