The central region of the coronal and radicular pulp contains large nerve trunks and blood vessels.

Apical foramen is the opening of the radicular pulp into the periapical connective tissue.

Radicular pulp is that pulp extending from the cervical region of the crown to the root apex.

Accessory canals are pathways from the radicular pulp, extending laterally through the dentin to the periodontal tissue seen especially in the apical third of the root.