Cornu Ammonis (Ammon horn) is the hippocampus proper, a curled band of three-layered cortex divided into fields CA1 to CA4. Together with the dentate gyrus it forms the classic seahorse shape seen in cross-section.
| Location | Floor of the inferior horn of the lateral ventricle, medial temporal lobe |
|---|---|
| Parts |
|
| Connections | |
| Blood Supply | Posterior cerebral artery (hippocampal branches); Anterior choroidal artery |
Forms and consolidates new memories of facts and events and maps space; CA3 links patterns and CA1 sends output.
CA1 neurons are very sensitive to low oxygen and die first after cardiac arrest, causing memory loss. In mesial temporal sclerosis, scarring of CA1 and CA4 causes drug-resistant epilepsy, which may be cured by surgery.
Neuron loss and scarring of the hippocampus, the commonest cause of drug-resistant epilepsy in adults.
Memory loss after cardiac arrest or near drowning from death of CA1 neurons.
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