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Sacral plexus and sciatic nerve

Formation and relations of the sacral plexus, distribution of its branches, sciatic-nerve course and tibial and fibular territories.

  • 25 explained questions
  • 21 flashcards
  • 72 estimated course minutes

Updated

What you will learn

  • Describe the formation, location and relations of the sacral plexus.
  • Identify its collateral branches and their muscular or cutaneous distribution.
  • Follow the sciatic nerve from the infrapiriform space to the popliteal fossa and recognize its collaterals.
  • Describe the courses, branches and territories of the tibial, common fibular, superficial fibular and deep fibular nerves.
  • Relate motor and sensory territories to dermatomes and to the main clinical syndromes.

Course outline

  1. From the sacral plexus to the foot

    Understand the continuity between sacral roots, the sciatic nerve and its two major branches.

    6 min

  2. Formation and topography

    The plexus lies in front of piriformis and is reconstructed from its roots.

    8 min

  3. Collateral branches of the plexus

    Match each collateral branch of the sacral plexus to its territory.

    10 min

  4. Sciatic nerve: course and collaterals

    Follow the sciatic nerve from the infrapiriform space to the popliteal fossa.

    12 min

  5. Tibial nerve

    Describe the medial sciatic branch, its leg relations and its territories.

    12 min

  6. Common fibular nerve and branches

    Follow the lateral sciatic branch and distinguish superficial from deep fibular nerves.

    15 min

  7. Territories, dermatomes and clinical anatomy

    Connect nerve maps and root maps to the syndromes described in the course.

    9 min

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