Sciatic Nerve (L4 – S2)

  • Function: The sciatic nerve supplies the hamstrings (semimembranous, semitendinous, biceps femoris) and the adductor magnus muscles which act to flex the knee, extend the hip, and adduct the leg. The sciatic nerve then divides into the tibial and common peroneal nerves in the popliteal fossa.
  • Anatomy:
    • Arises from posterior rami of L4-S2 segments
    • It emerges from the pelvis via the greater sciatic foramen below the piriformis muscle
    • It then descends laterally down the leg to supply the hamstrings and the adductor magnus. (which is also supplied by the obturator nerve)
    • At the popliteal fossa it divides into its two terminal branches, the tibial (medially) and the common peroneal (laterally) nerves

Sciatic Nerve

Hamstrings3

Sciatic Nerve Proximal Leg Muscle Actions

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