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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 ACDF - anterior cervical discectomy and fusion. ALIF - anterior lumbar interbody fusion. annulus - The outer layer of the intervertebral disc, which is located between the vertebral bodies. The annulus is made of collagen fibers. anterior - A term which describes the front of an object. Apophyseal Joints: Joints located in the posterior arch of the vertebral column. Also known as Facet Joints. autograft - Bone which is taken usually from the patient’s pelvis in order to fuse the spine.