The opening in the center of the crown of a tooth, which contains the pulp or nerve tissue and vessels, and stretches to the tip of the root.
The center or innermost portion of the tooth containing the pulp
The opening in the center of the crown of a tooth that contains the pulp (nerve tissue) and stretches to the tip of the root. See "What are teeth made of?"
The coronal portion of your tooth containing nerve cells and blood vessels.