LUMBAR VERTEBRA DRAW. Lumbar spinal nerves. Representation of the lumbar spinal nerves exiting from the lumbar vertebrae by the conjugation hole and giving an anterior branch passing before the transverse processes of the lumbar vertebrae and that innervates the muscles and the structures of the members and lateral and ventral parts of the trunk, and a posterior branch passing behind the transverse process and that innervates the deep muscles and the skin of the back. These anterior branches for