The dentate gyrus is a simple cortical region that is an integral portion of the larger functional
brain system called the hippocampal formation. In this review, the fundamental
neuroanatomical organization of the dentate gyrus is described, including principal cell
types and their connectivity, and a summary of the major extrinsic inputs of the dentate gyrus
is provided. Together, this information provides essential information that can serve as an
introduction to the dentate gyrus—a “dentate gyrus for dummies.”