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The sciatic nerve is the longest and largest nerve in the body; it measures three-quarters of an inch in diameter. It originates in the sacral plexus; a network of nerves in the low back (lumbosacral spine). The lumbosacral spine refers to the lumbar spine and the sacrum combined.he sciatic nerve starts in your low back, which is called your lumbar spine. The nerve roots are at the L4 and L5 vertebrae (the 'L' means lumbar, and the numbers indicate the level of the vertebraâwhere it is in your back). The sciatic nerve also travels through your pelvic region (sacrum).
Lumbar Sciatica L4 Vertebral Level. Sciatica L4 is a specific radiculopathy diagnosis which describes impingement upon or compression of the L4 spinal nerve root. L4 is one of the nerve roots which eventually join together to form the sciatic nerve.he L4 spinal nerve root joins up with the L5, S1, S2 and S3 nerves to create the sciatic nerve. This is the largest nerve in the body and has branches which descend down both legs.