Root of tooth within osseous socket - cross-section; human, adult

Stain: Hematoxylin and eosin. From left to right: bundle bone of alveolus; oblique fibers of periodontal ligament with blood vessels (broad layer); flattened cementoblasts settled on a thin light rim of cementoid; darker stained acellular cementum, the so-called acellular extrinsic fiber cementum as collagen fibers protrude from the periodontal ligament into cementum (Sharpey's fibers); incremental lines without cementocytes; dentinocemental junction as a wavy line; and dentin.