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Lumbar plexus

Formation, topography, collateral and terminal branches of the lumbar plexus, from L1 to the femoral and obturator nerves.

  • 20 explained questions
  • 16 flashcards
  • 62 estimated course minutes

Updated

What you will learn

  • Reconstruct lumbar-plexus formation from the anterior rami of L1–L4 and their anastomoses.
  • Locate the plexus between the vertebrae, costal processes, and iliopsoas bundles.
  • List its collateral twigs and six terminal branches.
  • Describe the course and branches of the iliohypogastric, ilioinguinal, lateral femoral cutaneous, and genitofemoral nerves.
  • Describe the terminal branches of the obturator and femoral nerves, including the saphenous nerve.

Course outline

  1. Orientation in the lumbar plexus

    A global view of the lumbar network and its six terminal branches before the detailed courses.

    5 min

  2. Formation and topography

    Connect each lumbar root to its anastomoses, then locate the network within iliopsoas.

    13 min

  3. Ilio-abdominal and genitofemoral branches

    Follow the first four terminal branches from the iliac crest to the anterior surface of iliopsoas.

    14 min

  4. Obturator nerve

    From L2–L4 to the obturator foramen, follow the anterior and posterior branches and their muscle targets.

    13 min

  5. Femoral nerve and terminal branches

    Describe the plexus's largest branch and the destination of its four terminal branches.

    17 min

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