Daigram of hippocampal regions. DG: Dentate gyrus.

Cornu Ammonis, literally "Amun's horns", refers to the different regions of the hippocampus. Cornu Ammonis is abbreviated "CA" for the purposes of this reference. For example, input comes into the hippocampus from the entorhinal cortex to the dentate gyrus. The dentate gyrus then sends information to the next relay within the hippocampus, CA3. The horned appearance is caused by cell density differentials and the existence of varying degrees of neuronal fibers. The dentate gyrus is part of the hippocampal formation. ... Amun (also spelt Amon, Amoun, Amen, and rarely Imenand, and spelt in Greek as Ammon, and Hammon) was the name of a deity, in Egyptian mythology, who gradually rose to become one of the most important, before disappearing back into the shadows. ... The location of the hippocampus in the human brain. ... The entorhinal cortex (EC) is an important memory center in the brain. ... The dentate gyrus is part of the hippocampal formation. ... Neurons (also spelled neurones or called nerve cells) are the primary cells of the nervous system. ...