Those attaches to medial and lateral epicondyle of humerus
Medial epicondyle: shallow layer of flexor muscles of forearm, that is, pronator teres, flexor carpi radialis, palmaris longus, and flexor digitorum superficialis muscles
Lateral epicondyle: shallow layer of extensor muscles of forearm, that is, extensor carpi radialis longus, extensor carpi radialis brevis, extensor digitorum, extensor digiti minimi, extensor carpi ulnaris, anconeus, and supinator muscles