Plexuses6 min read

The sacral plexus

L4–S4 on the posterior pelvic wall, origin of the sciatic nerve.

Formation

The lumbosacral trunk carries L4 and L5 fibres down to join S1–S4 on the anterior surface of the piriformis, forming a flat triangular plexus.

Surface field

Gluteal, posterior femoral, sciatic and pudendal branches together cover the gluteal region, posterior thigh, leg, foot and perineum.

Related formulations

In the atlas

Sacral region

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Educational reference material. Nothing in the Knowledge Center is medical advice, and no therapeutic effect is claimed or implied.

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Related knowledge

Structures, formulations and documentation connected to this article.

Formulation

FormulationSX DUOSacral application concept designed for the lower posterior pelvic surface.→FormulationPlexus Lumbosacralis DUOTransition concept for the lumbosacral field, where lumbar and sacral territories meet across the pelvic rim.→FormulationInflammaSacraHorizontal, symptom- and phase-oriented support line for pain, irritation and inflammatory tissue reactivity — applicable anywhere on the body.→

Plexus

PlexusSacral plexusGluteal region, posterior thigh, leg, foot and perineum.→PlexusCervical plexusLateral neck, occipital scalp, periauricular field and clavicular line.→PlexusBrachial plexusSupraclavicular fossa, shoulder cap, arm, forearm and hand.→PlexusLumbar plexusLower back, inguinal line, anterior and medial thigh.→

Knowledge article

Knowledge articleThe lumbar plexusL1–L4 within the psoas major, projecting onto the anterior thigh.→Knowledge articleNeurocutaneous anatomyThe interface where peripheral nerve architecture meets the skin, and how SIRIAM defines its zones.→