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Spine Anatomy & Glossary A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z lamina - The bone which is located in the posterior portion of the vertebrae. laminectomy - The removal of the lamina, frequently done to relieve pressure on the nerves (spinal stenosis). laminotomy - A removal of a small portion of the lamina, frequently done to remove a portion of the disc. lordosis - The normal backward curve which occurs in the cervical and lumbar region. lumbar - The lowest portion of the spine. There are five lumbar vertebrae in the low back.