Band of Giacomini
The band of Giacomini, also known as the tail of the dentate gyrus is the anteromedial continuation of the dentate gyrus, which in turn is part of the hippocampal formation, along with the hippocampus, subicular complex and entorhinal cortex. It is an important anatomical landmark of the inferior surface of the uncus, separating in into the intralimbic gyrus posteriorly, and anterior uncinate gyrus anteriorly 1,2.
The band of Giacomini is a visible segment of the dentate gyrus, in contrast to most of the dentate gyrus which is not exposed on the brain surface1. It is the anteromedial continuation, underlying the head of the hippocampus, of the margo denticulatus which relates to the hippocampal body 3.
Posterior to the band of Giacomini, the uncal apex is formed by CA3 and CA4, and covered by the alveus. The fimbria is attached to its extremity 1.