- Dentinal tubules are microscopic canals found within the dentin of a tooth.
- Their primary function is to transmit sensory stimuli, such as temperature changes and pain, to the dental pulp.
- These tubules contain extensions of odontoblasts called odontoblastic processes and fluid, which help in conducting stimuli.
- This mechanism explains why dentin can be sensitive to external factors such as heat, cold, or mechanical pressure.

- It is important to note that dentinal tubules do not facilitate nutrient transport directly to odontoblasts, nor do they serve as channels for blood vessels (which are located within the pulp).
- Additionally, enamel mineralization occurs at the enamel-dentin junction and is not directly influenced by dentinal tubules.

Key Points:
- Dentinal tubules transmit sensory stimuli to the pulp.
- They contain odontoblastic processes and fluid important for sensation.
- They do not contain blood vessels.
- Nutrients are transported via the pulp, not through tubules.
- Enamel mineralization is independent of dentinal tubules.

Reference: Orban's Oral Histology, 14th Edition, Chapter 5, Page 105