The Microscopic Anatomy of the Teeth (Classic Reprint)

This section reveals how enamel forms inside the jaws of fish, showing living processes at work.

In the study of tooth enamel, the author follows several fish families to show how enamel develops. The enamel organ can be fed by blood vessels and a gland‑like tissue that invades the organ from outside, replacing the traditional enamel‑forming layer. Lime salts are elaborated in these gland‑like structures and moved to the forming enamel through surrounding stroma and vascular channels. In some fish, enamel appears ahead of dentine, while in others, the timing and arrangement of tissues differ, yet the basic pattern remains the same: vessels, glands, and a stroma coordinate the calcification process.

The text documents how the enamel organ in species such as Sargus and Labrus shows a distinct separation between the enamel and dentine while a vascular system delivers the minerals. In young germs, an ameloblast layer and external epithelium are present, but are eventually replaced by gland‑like tissue and tubular secretions. Across different wrasses and related fishes, the arrangement of vascular tubes, gland‑like structures, and calcospherites can vary, yet they all serve to deposit enamel before or with the first dentine.

• How enamel organs change from epithelial layers to gland‑driven structures during growth.
• How blood vessels and tubular secretions transport lime salts to the forming enamel.
• Why some fish lay down enamel before dentine and how this affects tooth development.
• Variations in enamel formation across different fish families and species.

Ideal for readers of vertebrate dental anatomy and histology who want a clear, accessible view of enamel formation in fish.