Anatomy study note · Upper limb

Musculocutaneous nerve

A branch of the lateral cord (C5–7) that supplies the flexor muscles of the arm and ends as the lateral cutaneous nerve of the forearm.

Key points

• Lateral cord, C5–7.
• Pierces coracobrachialis; between biceps and brachialis.
• Supplies all anterior arm muscles.
• Ends as the lateral cutaneous nerve of the forearm.
• Upper limb nerves: C4–T2 segments; lower limb: L2–S2.
• Ventral root: basal-lamina neurons. Dorsal root: neural-crest ganglion cells.
• Nerve: epineurium → perineurium (blood–nerve barrier) → endoneurium.
• Cut nerve: Wallerian degeneration; regrows 0.5–3 mm/day.

The full note in the atlas also covers

Course · Branches · Histology · Development · Clinical notes

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 3, PDF p. 345
• Inderbir Singh’s Human Embryology, ch. 17, PDF pp. 318, 321, 323–325; ch. 10, PDF pp. 143–144
• BRS Cell Biology & Histology, 7th ed., ch. 9, PDF pp. 163–166, 171–172

More from the upper limb

• Nerve to subclavius
• Palmar aponeurosis
• Palmaris longus
• Pectoral nerves
• Pectoralis major
• Pectoralis minor
• Phalanges of the hand
• Pronator quadratus
• Pronator teres
• Radial artery
• Radial nerve
• Radioulnar joints and interosseous membrane

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