Hunter & Schreger Bands : The optical phenomenon seen as alternating light and dark bands, from DEJ towards the surface. Traversing 2/3rd of the enamel thickness. ( Reflected light)
E- Enamel
D- Dentin
SR- Striae of Retzius ( Concentric rings produced by incremental enamel deposition)
NL- Neonatal line A prominent SR seen in deciduous teeth and at times cusps of permanent first molar
DEJ- Dentinoenamel Junction