intertubular zone

in·ter·tu·bu·lar zone

the dentinal matrix that lies between zones of peritubular dentin; it is less calcified and contains larger collagen fibers than does peritubular dentin.

in·ter·tu·bu·lar zone

(intĕr-tūbyū-lăr zōn)
Dentinal matrix that lies between zones of peritubular dentin.