1. Enamel Secretion

2. Periodontal Ligament

3. Collagen Fibers in the Periodontal Ligament

4. Intermediate Plexus of Collagen Fibers in the PDL

5.Principal Fiber Groups

6. Principal Fibers of PDL

7. Horizontal Fibers of the PDL

8. Transseptal Fibers of the PDL

9. Principal Fibers

10. Apical Foramen

11. Principal Fibers Between Teeth

12. The Interradicular Septum

13. The Interdental Septum

14. Mineralized Deposits in the PDL

15.Dentogingival Junction

16. Junctional Epithelium