- Alveus
- A thin sheet of white matter
- Formed by the axons of the hippocampal pyramidal cells
- Covers the ventricular surface of the hippocampus.
- Thickens along the medial edge of the hippocampus to form the fimbria.
- Represents subcortical white matter of the hippocampal allocortex.
- At the temporal lobe, the fimbria is separated from the dentate gyrus by the fimbrodentate sulcus.
- Forms the Fornix
- The fimbria is the initial part of the fornix
- The fimbriae passes posteriorly to become the crus of the fornix;
- It represents the subcortical radiation of the hippocampal allocortex.
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