Each lumbar vertebra is made up of the same components:
Vertebral body: round block of bone that makes up the main section of the vertebra.
Pedicles: 2 bones that connect directly to the back of the vertebral body and are part of the bony structures that protect the spinal cord.
Lamina: 2 bones that connect to the pedicles to form the outer ring of the spinal canal.
Facet joints: each vertebra has 2 sets of facets. One pair faces up and one pair faces down. 2 adjacent vertebrae are connected in the back of the spine by 2 facet joints. These joints allow flexion (bending forward), extension (bending backward), and twisting motions.
Spinous process: along the back of your spine, furthest away from the delicate nerve roots, are the spinous processes. These are the bones you feel as run your fingers down the center of your back.
Transverse process: bony knobs that project out from the side of the spinal canal, one on the left and one on the right.