Modelled according to nature, in SOMSO-PLAST®. After Dr. Lie. Presentation of normal anatomy in conjunction with pathological changes: I. Normal anatomy, II. Annular fibrous connection according to Rumpert, III. Dorso-lateral nuclear prolapse, IV. Medial prolapse, V. Spinal stenosis, VI. L-4 Vertebral spondylolysis. Separates into 10 parts. On a transparent base.