Discovered by the pioneering histologist Santiago Ramón y Cahal, pyramidal neurons are found throughout the brain, including the cortex, amygdala, and the hippocampus. These neurons are named after the pyramidal shape of their cell body. Within the cortex, pyramidal neurons are essential for cognition, providing a mechanism for the various layers to communicate with each other. In the hippocampus, these neurons project throughout the structure as well as provide a means for signals to enter and leave the hippocampus, and make up both the Schaffer Collaterals and the Perforant Path. Within the amygdala, pyramidal neurons are involved in emotional processing, and, along with their counter-parts in the hippocampus, are essential for emotional memory consolidation.