Anatomy study note · Lower limb

Interossei of the foot

The fourth (deepest) layer of the sole: plantar and dorsal interossei between the metatarsals, with the tendons of fibularis longus and tibialis posterior.

Key points

• Fourth layer of the sole.
• Axis = second toe (hand: middle finger).
• Lateral plantar nerve (deep branch mostly).
• 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

Action · Nerve supply · Histology · Development

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 11, PDF pp. 1378, 1383–1384, 1419
• 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

• Joints of the forefoot and toes
• Knee joint
• Menisci of the knee
• Metatarsal bones
• Patella
• Pectineus
• Phalanges of the foot
• Plantar aponeurosis
• Plantar arteries
• Plantar nerves
• Plantaris
• Popliteal artery

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