Natural cast from a real bone specimen this full-size replica provides lifelike accuracy in color, texture, and special details including: completely flexible articulation to reproduce natural vertebral movements and alignments,occipital bone of skull,spinal cord with medulla,vertebral arteries,paired spinal nerves, detachable sacral flap which exposes the branching cauda equina,proximal femur segments articulated to duplicate movement at the ball and socket joint of the hip.This version of our Premier flexible spine not only incorporates all of the life-like details from above, but in addition includes a herniated lumbar disk between L4 and L5.Without peer for patient education as well as introductory classes in anatomy and physical therapy, this special edition of our Premier spine series includes all the exceptional attributes above, plus distinctive colors to differentiate the cervical (yellow), thoracic (orange) and lumbar (brown) vertebrae.Includes suspension stand.