Parahippocampal gyrus

Location

Occupies the transitional area between the basal and the mesial surfaces of the temporal lobe.
Contiguous with the fusiform gyrus and with the remainder of the basal surface of the brain.

just below the splenium of the corpus callosum, it is often intersected by the anterior calcarine sulcus, which divides the posterior portion of the parahippocampal gyrus into

Isthmus of the cingulate gyrus superiorly, which continues as the cingulate gyrus
Lingual gyrus, floor of the calcarine sulcus

Posterior: collateral sulcus, which bulges superiorly into the lateral part of the floor of the temporal horn as the collateral eminence anteriorly and the collateral trigone posteriorly

the location of the collateral sulcus and consequently the location of the lateral part of the floor of the temporal horn can be determined angiographically by following the inferior temporal branches of the posterior cerebral artery as they descend into the depth of the collateral sulcus before continuing on the surface of the fusiform gyrus

An important histological concept that plays a major role in neurosurgery, and especially in epilepsy surgery,
Located within the anterior 1/3 of the parahippocampal gyrus and the anteroinferior portion of the anterior segment of the uncus;
posteriorly, on the parahippocampal gyrus, it extends slightly behind the level of the posterior pole of the uncus.
The entorhinal area therefore forms a "shell" around the temporal amygdala
It is limited laterally by the rhinal sulcus anteriorly and the collateral sulcus posteriorly.
The entorhinal area is composed of the six-layered mesocortex,
F(x)

A relay for both efferent and afferent connections between the hippocampus and the isocortical association cortex in the temporal parietal, and frontal lobes