Anatomy study note · Upper limb

Medial cutaneous nerves of arm and forearm

Two sensory branches of the medial cord that supply the skin on the medial side of the arm and forearm.

Key points

• Both from the medial cord.
• Arm: T1 + intercostobrachial (T2).
• Medial forearm skin = C8–T1 dermatomes.
• 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

Branches · Histology · Development · Clinical notes

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 3, PDF pp. 340–342
• 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

• Median cubital vein
• Median nerve
• Metacarpal bones
• Metacarpophalangeal and interphalangeal joints of the hand
• Musculocutaneous nerve
• Nerve to subclavius
• Palmar aponeurosis
• Palmaris longus
• Pectoral nerves
• Pectoralis major
• Pectoralis minor
• Phalanges of the hand

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