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With regard to the
brain, the fimbria is a prominent band of white matter along the medial edge of the hippocampus. It is a complex fibre bundle that runs from the lateral surface of the Hippocampal formation to other regions of the forebrain
The fimbria is an accumulation of myelinated
axons (mostly efferent) that first collect on the ventricular surface of the hippocampus as the alveus (a thin layer resembling an inverted trough).
splenium the fimbria separates from the hippocampus as the crus of the fornix. So that section which runs rostrally from the hippocampus forms the fornix. This is divided in turn into:
Additional images Edit
Section of brain showing upper surface of temporal lobe.
Scheme of rhinencephalon.
Posterior and inferior cornua of left lateral ventricle exposed from the side.
Inferior and posterior cornua, viewed from above.
The fornix and corpus callosum from below.