What is referred to as the area of bone between the roots in multirooted teeth?

The area of bone between the roots of multirooted teeth is known as the interradicular septum. This septum plays a crucial role in supporting and stabilizing the roots of the teeth, providing structural integrity, and allowing for the distribution of forces during chewing.

In multirooted teeth, such as molars, the roots may have varying orientations and need adequate bone support to function properly without risk of mobility or loss. The interradicular septum is specifically the bony tissue located directly between these roots, distinguishing it essentially from surrounding bone structures that serve different functions.

Other terms in the choices refer to different anatomical structures. The alveolar crest is the highest point of the alveolar bone that supports the teeth, while periodontal ligaments serve to attach the tooth roots to the surrounding alveolar bone and assist with shock absorption during mastication. A transverse ridge typically refers to a surface feature on a tooth rather than a structural bone area. All these structures play essential roles in dental anatomy and function, but in the context of the question, the interradicular septum is the specific area of interest concerning bone situated between the roots of multirooted teeth.