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Anatomy Atlases: Atlas of Microscopic Anatomy: Section 1 - Cells Atlas of Microscopic Anatomy: Section 10 - Digestive System

Plate 10.186 Tooth (In Situ)

Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger, Jr., Ph.D.
Peer Review Status: Externally Peer Reviewed


Plate 10.186 Tooth (In Situ)

Cat, 10% formalin, decalcified, 4.6 x.

This in-situ decalcified tooth section illustrates many features of tooth structure. Realize that the enamel has been removed during the process of decalcification.

Note the crown (i.e., that part that projects above the gingiva) and root (i.e., that part located in the osseous alveolar socket).

Note the named parts of the gingiva: the superior free margin and the free gingival sulcus. The junctional epithelium of the gingiva ends by joining the cementurn and periodontal ligament. If the junction between the parts fails to remain sealed, infection of the periodontal tissues occurs (gingivitis), possibly leading to serious periodontal disease.

The alveolar bone (or tooth socket) functions as the insertion for periodontal ligament fibers, which join tooth to bone.

Human teeth never directly fuse with the alveolar bone, but rather, the tooth is suspended from the bone by the periodontal ligament.

Cementum, which forms the outer surface of the root, is composed of calcified collagenous fibrils, glycoproteins, and glycosaminoglycans.

Note the inferior alveolar nerve and blood vessels in the yellow (non-hematopoietic, fatty) bone marrow of the mandible.

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