Tennis elbow results in strain of the common extensor tendon and inflammation of the periosteum of lateral epicondyle.

Lateral elbow pain, often felt when opening a door or lifting a glass.

origins of the muscles that may be affected (all have extensor in the name so if you remember that you could get this question by elimination)

1. extensor carpi radialis longus
2. extensor carpi radialis brevis
3. extensor digitorum
4. extensor digiti minimi
5. extensor carpi ulnaris

From the 100 most important Anatomy Conceptions PPT (St Matthews University)

"Tennis elbow" is due to radial nerve impingement near the lateral epicondyle of the humerus. Extensor carpi radialis brevis is a muscle of the extensor compartment of the forearm, originates from the lateral epicondyle as well.

wrist extensors (tennis - backhand)--> lateral epicondyl wrist flexors (golf - think near shot - don't know what it's called) - medial epicondyl