Short head: Tip of coracoid process of scapula. ,

Long head: Supraglenoid tubercle of scapula. 

Tuberosity of radius and fascia of forearm via bicipital aponeurosis. 

Supinates forearm.,

When supine (facing up), it flexes forearm..

Musculocutaneous nerve (C5 and C6 ).

Muscular branches of brachial artery.