Biceps Brachii
Shoulder & Arm
The classic 'flex' muscle — but it's actually a more powerful supinator than elbow flexor.
Function
Flexes elbow, supinates forearm, assists shoulder flexion
Origin
Long head: supraglenoid tubercle; Short head: coracoid process
Insertion
Radial tuberosity and bicipital aponeurosis
Innervation
Musculocutaneous nerve (C5-C6)