The collateral eminence is an elongated swelling lying lateral to and parallel with the

hippocampus The hippocampus (via Latin from Greek , 'seahorse') is a major component of the brain of humans and other vertebrates. Humans and other mammals have two hippocampi, one in each side of the brain. The hippocampus is part of the limbic system, a ...

. It corresponds with the medial part of the

collateral fissure The collateral fissure (or sulcus) is on the tentorial surface of the hemisphere and extends from near the occipital pole to within a short distance of the temporal pole. Behind, it lies below and lateral to the calcarine fissure, from which it ...

, 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 The lateral ventricles are the two largest ventricles of the brain and contain cerebrospinal fluid (CSF). Each cerebral hemisphere contains a lateral ventricle, known as the left or right ventricle, respectively. Each lateral ventricle resemble ...

, situated between the posterior and inferior cornua. It is not always present.

References

Cerebrum Anatomical variations {{neuroscience-stub