This structure at the base of the brain (top of the spinal cord) is the principal point of entry of life force (prana) into the body. It is the seat of the sixth cerebrospinal center, whose function is to receive and direct the incoming flow of cosmic energy. The life force is stored in the seventh center (sahasrara) in the topmost part of the brain. From that reservoir it is distributed throughout the body. The subtle center at the medulla is the main switch that controls the entrance, storage, and distribution of the life force.