the.com/sciatic
A nerve so long it can ruin your whole leg from one bad sit.
means Relating to the sciatic nerve, the body's largest, running from lower back down through the buttock and leg.
from From Greek ischiadikos, meaning of the hip, via the ischion, the hip joint where the trouble famously begins.
Size recordThickest nerve in the human body.
Long reachRuns from spine to toes via the foot.
Pinch pointOften compressed by a herniated disc.