The fifth lumbar spine vertebrae (L5) is part of the greater lumbar region. To the human eye, this is the curve just above the buttocks, which is also commonly referred to as the small of the back. The L5 is larger than its counterparts located in the thoracic and cervical regions.
Lumbar spinal stenosis is a narrowing of the spinal canal, compressing the nerves traveling through the lower back into the legs. While it may affect younger patients, due to developmental causes, it is more often a degenerative condition that affects people who are typically age 60 and older.
This disc provides cushioning and shock-absorbing functions to protect the vertebrae from grinding against each other during spinal movements. Read more about Spinal Discs. The height of the L4-L5 disc plays an important role in maintaining the lordosis (inward curvature) of the lumbar spine. 2. L4 spinal nerve.This diagram with labels depicts and explains the details of Spine L5.