The fimbria is a flat band of white matter fibres along the inner edge of the hippocampus. The fibres gather from the surface of the hippocampus (alveus) and continue backwards and upwards as the crus of the fornix.
| Location | Medial edge of the hippocampus in the floor of the inferior horn of the lateral ventricle |
|---|---|
| Parts |
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| Connections | |
| Blood Supply | Anterior choroidal artery; Posterior cerebral artery branches |
Carries output fibres from the hippocampus into the fornix, part of the memory circuit.
The choroid plexus of the temporal horn attaches along the fimbria, a landmark in temporal lobe surgery. Damage to these fibres can contribute to memory impairment.
Interruption of hippocampal output fibres causing difficulty forming new memories.
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