What types of cells are found in the hippocampal formation?

The hippocampal formation contains several types of neurons and glial cells:

1. Granule Cells: Found in the dentate gyrus, these cells are involved in the initial processing of incoming information.
2. Pyramidal Neurons: Located in the CA regions, these cells are the primary excitatory neurons and play a crucial role in the hippocampal circuitry.
3. Interneurons: These inhibitory neurons are scattered throughout the hippocampus and are essential for modulating the activity of excitatory neurons.
4. Astrocytes: These glial cells provide support and maintain the extracellular environment.
5. Microglia: Act as the immune cells of the brain, responding to injury and disease.