Anatomy study note · Lower limb

Sural nerve

A cutaneous branch of the tibial nerve, usually joined by the sural communicating branch of the common fibular nerve, supplying the back of the leg and lateral foot.

Key points

• Tibial nerve (+ common fibular communicating branch).
• With the small saphenous vein behind the lateral malleolus.
• Lateral foot + little toe skin.
• 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

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 11, PDF pp. 1336–1337, 1348, 1363
• 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 lower limb

• Tarsal bones
• Tarsal joints and arches of the foot
• Tendo calcaneus
• Tensor fasciae latae
• Tibia
• Tibial nerve
• Tibialis anterior
• Tibialis posterior
• Tibiofibular joints
• Adductor brevis
• Adductor longus
• Adductor magnus

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