Your sciatic nerve runs from your lower back, through your buttock, down the back of your leg, and into your foot.

Where exactly is your sciatic nerve?

  • It starts in the lower spine, from nerve roots L4 to S3 in the lumbosacral plexus (low back and pelvis).
  • It passes out of the pelvis through the greater sciatic foramen (sciatic notch), deep in the buttock, just below a small muscle called the piriformis.
  • It then travels down the back of the thigh , between the big hamstring muscles (behind the femur).
  • Around the back of the knee (popliteal fossa), it usually splits into the tibial nerve and the common fibular (peroneal) nerve, which continue down the leg to the heel and foot.

In simple terms: if you trace a line from the middle of your low back, through the center of your buttock, along the back of your thigh and calf to your heel, you’re following the sciatic nerve’s general path.

What does the sciatic nerve do?

  • It is the largest and one of the longest nerves in the human body.
  • It carries both motor and sensory fibers (a “mixed” nerve), helping control movement and sensation in much of the thigh, leg, and foot.

Because it serves such a big area, irritation or compression of this nerve (often called “sciatica”) can cause pain, tingling, numbness, or weakness that radiates from the lower back into the buttock and down the leg.

If you have new, severe, or worsening leg pain, numbness, or weakness, or trouble controlling your bladder or bowels, seek urgent medical care, as those can be signs of a serious condition.

Note: This is general educational information and not a diagnosis or medical advice. If you’re worried about sciatic nerve pain, talk to a healthcare professional for a proper evaluation.

Information gathered from public forums or data available on the internet and portrayed here.