Anatomy study note · Lower limb

Extensor hallucis longus

The long extensor of the big toe in the anterior compartment of the leg.

Key points

• Fibula → distal phalanx of the big toe.
• Deep fibular nerve.
• Big-toe extension + dorsiflexion (L5 test).
• 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. 11, PDF pp. 1350, 1351–1352
• 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 lower limb

• Femoral artery
• Femoral nerve
• Femoral vein
• Femur
• Fibula
• Fibularis brevis
• Fibularis longus
• Fibularis tertius
• Flexor digitorum longus
• Flexor hallucis longus
• Gastrocnemius
• Gluteal nerves

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