Sciatic Nerve Anatomy

Interactive anatomy viewer for the sciatic nerve — explore the L4–S3 nerve roots, pathways, and clinical significance with guided tracing. Built for massage therapists and students by Aurelia RMT.

Anatomical Regions

• Lumbosacral Plexus — Nerve roots L4, L5, S1, S2, S3 converging to form the sciatic nerve
• Piriformis — Deep gluteal muscle; sciatic nerve typically exits deep to piriformis through the greater sciatic foramen
• Greater Sciatic Foramen — Bony exit of the sciatic nerve from the pelvis into the gluteal region
• Posterior Thigh — Sciatic nerve descends between the biceps femoris, semimembranosus, and semitendinosus
• Popliteal Fossa — Division into tibial nerve (medial) and common fibular (peroneal) nerve (lateral)
• Tibial Nerve — Supplies posterior compartment of the leg and plantar intrinsic muscles of the foot
• Common Fibular (Peroneal) Nerve — Winds around the fibular head; supplies anterior and lateral leg compartments
• Sural Nerve — Sensory branch providing cutaneous innervation to the lateral foot and fifth toe

Common Clinical Conditions

• Sciatica — Radicular pain from lumbar disc herniation compressing L4–S3 nerve roots
• Piriformis Syndrome — Sciatic nerve compression by piriformis causing buttock pain and radiating symptoms
• Common Peroneal Nerve Palsy — Foot drop from compression at the fibular head
• Hamstring Referred Pain — Trigger-point referral patterns mimicking sciatic nerve radiculopathy

Frequently Asked Questions

What causes sciatic nerve pain?

Sciatica is most commonly caused by a herniated lumbar disc compressing one or more of the L4–S3 nerve roots. Other causes include piriformis syndrome, spinal stenosis, degenerative disc disease, and spondylolisthesis.

Where does the sciatic nerve run in the body?

The sciatic nerve forms from nerve roots L4–S3 in the lumbosacral plexus. It exits the pelvis through the greater sciatic foramen, passes deep to the piriformis, and travels down the posterior thigh before dividing at the popliteal fossa into the tibial and common fibular nerves.

Can massage therapy help relieve sciatic nerve pain?

Massage can help manage sciatic pain by reducing muscle tension in the piriformis, gluteals, and hamstrings, improving circulation, and decreasing nerve compression from myofascial tightness. It is most effective as part of a multidisciplinary approach.