Elbow muscle- Flexors, Extensors, Pronators, Supinators.

 Biceps brachii 

Origin:- long head - supraglenoid tubercle of scapula and glenoid labrum; Short head - apex of coracoid process
Insertion:- posterior part of radial tuberosity, bicipital aponeurosis into deep fascia over common flexor origin. 
Nerve:- Musculocutaneous nerve (C5, C6) 
Action:- flexes shoulder and elbow, supinates forearm

Brachialis 

Origin:- Lower half of anterior surface of humerus, intermuscular septum
Insertion:- coronoid process and tuberosity of ulna
Nerve:- musculocutaneous nerve (C5, C6), radial nerve (C7) 
Action:- flexes elbow

Brachioradialis

Origin:- Upper two-thirds of lateral supracondylar ridge of humerus, lateral intermuscular septum
Insertion:- lateral side of radius above styloid process
Nerve:- radial nerve (C5, C6) 
Action:- Flexes elbow

Pronators teres 

Origin:- Humeral head - Medial epicondyle Via common flexor Tendon, intermuscular septum, antebrachial fascia; ulnar head - medial part of Coronoid process
Insertion:- middle of lateral surface of radius
Nerve:- Median nerve (C6, C7) 
Action:- pronate forearm, flexes elbow

Pronator Quadratus 

Origin:- Lower quarter of anterior surface of ulna
Insertion:- lower quarter of anterior surface of radius
Nerve:- anterior interosseous branch of median nerve (C7, C8) 
Action:- pronate forearm

Anconeus

Origin:- Posterior surface of lateral epicondyle of humerus
Insertion:- lateral surface of olecranon, upper quarter of posterior surface of ulna
Nerve:- radial nerve (C6-C8) 
Action:- extends elbow

Supinator 

Origin :- inferior aspect of lateral epicondyle, radial collateral ligament, annular ligament, supinator crest and fossa of ulna 
Insertion:- posterior, lateral and anterior aspects of upper third of radius
Nerve:- posterior interosseous nerve (C6, C7) 
Action:- supinates forearm

Triceps brachii

Origin:- long head - infraglenoid tubercle of scapula, shoulder capsule; lateral head - above and lateral to spiral groove on posterior surface of humerus; medial head - below and medial to spiral groove on posterior surface of humerus
Insertion: upper surface of Olecranon, deep fascia of forearm
Nerve:- radial nerve (C6-C8) 
Action:- extends elbow and shoulder

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