2014诺贝尔生理学或医学奖 Grid cells, together with other cells in the entorhinal cortex that recognize the direction of the head of the animal and the border of the room form networks with the place cells in the hippocampus. This circuitry constitutes a comprehensive Fig 3 positioning system, an inner GPS, in the brain. The positioning system in the human brain appears to have similar components as those of the rat brain2014诺贝尔生理学或医学奖