The inner wall of the tubule is highly calcified and termed as
Dentin is made up of dentinal tubules. The dentinal tubules contain the protoplasmic process of the odontoblasts called odontoblastic process. The inner wall of the tubule is highly calcified and is termed as peritubular or intratubular dentin. Between the tubules is the intertubular dentin and it is calcified to a lesser degree than peritubular dentin.
Peritubular dentin
Intratubular dentin
Both
Mantle dentin