Anatomy study note · Upper limb

Thoracodorsal nerve

A branch of the posterior cord (C6, 7, 8) that supplies latissimus dorsi.

Key points

• Posterior cord (C6, 7, 8).
• Supplies latissimus dorsi.
• Latissimus dorsi = extension, adduction, medial rotation of the arm.
• 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 · Histology · Development

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 3, PDF pp. 302, 340
• 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

• Trapezius
• Triceps brachii
• Ulna
• Ulnar artery
• Ulnar nerve
• Veins of the hand
• Wrist joint
• Abductor pollicis longus
• Acromioclavicular joint
• Adductor pollicis
• Anconeus
• Axillary artery

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