Biceps Brachii

Musculus biceps brachii

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The biceps brachii is the prominent two-headed flexor of the anterior arm, driving elbow flexion and forearm supination while also assisting shoulder flexion and abduction. Because it is strongest as a supinator-flexor, supinated curls (barbell, EZ-bar, incline dumbbell) load it most directly, while the long head responds to stretched positions like incline curls. It crosses both the shoulder and elbow, so its function depends on the position of both joints.

Actions

Elbow flexion, Forearm supination, Shoulder flexion, Shoulder abduction

Origin

Long head: supraglenoid tubercle of the scapula; Short head: coracoid process of the scapula

Insertion

Radial tuberosity and, via the bicipital aponeurosis, into the deep fascia of the medial forearm

Innervation

Musculocutaneous nerve (C5–C7)

Blood supply

Muscular branches of the brachial artery

Heads

Long head, Short head

Wikipedia ↗

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