This image shows a cross section of the maxillary alveolar process at the mid-root level of the teeth. The bone between the roots of a tooth is called interradicular bone or interradicular septum. The bone between the roots of adjacent teeth is called interdental bone or interdental septum. Trabecular bone occupies most of the interdental bone. The cortical plates are the outer walls of the alveolar process. The alveolar bone proper can be seen on the inside of the tooth socket. It is characterized by numerous perforations present on the bone surface facing the roots that are known as Volkmann's canals.