Anatomy study note · Abdomen

Iliohypogastric and ilioinguinal nerves

The two branches of the first lumbar nerve that supply the lowest part of the anterior abdominal wall, running like the lower intercostal nerves but without entering the rectus sheath.

Key points

• Both from L1 (lumbar plexus).
• Iliohypogastric pierces the external oblique above the superficial ring.
• Ilioinguinal passes through the superficial ring.
• Skin above the pubis = L1.
• Ventral root: basal-lamina neurons. Dorsal root: neural-crest ganglion cells.
• Schwann cells: neural crest.
• 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 · Clinical notes

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 6, PDF pp. 694–696, 716–720, 765
• Inderbir Singh’s Human Embryology, ch. 17, PDF pp. 318, 321, 323–325
• BRS Cell Biology & Histology, 7th ed., ch. 9, PDF pp. 163–166, 171–172

More from the abdomen

• Inferior epigastric vessels
• Inferior mesenteric artery
• Inferior vena cava
• Inguinal ligament
• Internal oblique
• Jejunum and ileum
• Kidney
• Large intestine
• Linea alba
• Liver
• Lumbar plexus
• Pancreas

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