Anatomy study note · Upper limb

Biceps brachii

The two-headed muscle on the front of the arm. It is a powerful supinator of the forearm and a flexor of the elbow.

Key points

• Long head: supraglenoid tubercle; short head: coracoid.
• → radial tuberosity + bicipital aponeurosis.
• Musculocutaneous nerve (C5, 6).
• Supinates (strongest) + flexes the elbow.
• Biceps jerk = C5, 6.
• Limb muscles: in situ from limb-bud mesenchyme.
• Upper limb bud C4–T2; lower limb bud L2–S2.
• Skeletal muscle: multinucleated, peripheral nuclei, striated.
• Epimysium → perimysium → endomysium.

The full note in the atlas also covers

Origin · Insertion · Action · Nerve supply · Histology · Development · Clinical notes

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 3, PDF pp. 306, 357–358
• Inderbir Singh’s Human Embryology, ch. 7, PDF p. 109; ch. 10, PDF pp. 142–145
• BRS Cell Biology & Histology, 7th ed., ch. 8, PDF pp. 135–144

More from the upper limb

• Brachial artery
• Brachial plexus
• Brachialis
• Brachioradialis
• Breast
• Carpal bones
• Cephalic vein
• Clavicle
• Coracobrachialis
• Deltoid
• Dorsal scapular nerve
• Elbow joint

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