The collateral eminence is an elongated swelling lying lateral parallel with the hippocampus.

It corresponds with the medial part of the collateral fissure, and its size depends on the depth and direction of this fissure.

It is continuous behind with a flattened triangular area, the trigone of the lateral ventricle, situated between the posterior and inferior horn.

[1] This article incorporates text in the public domain from page 833 of the 20th edition of Gray's Anatomy (1918)

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