This field is located between the ventral-intermediate entorhinal area (VIE) and the amygdalohippocampal transition area. The former is caudal and the latter is anterior to AE. Laterally, AE borders with the dorsal-intermediate entorhinal area (DIE), while medially it abuts on the periamygdaloid cortex.
The lamination of this field is less developed than in the remainder of
entorhinal fields. Layer I is very broad and has a scalloped border
with layer II. Layers II and III merge, and are made up of small-sized
cells. There is a distinct tendency for cells in layers II and III to
form clusters, leaving broad gaps in between. Layer V is characterized
by the presence of a population of slightly larger neurons, more
homogeneous in appearance than layer III. Layer VI is mainly made up of
a variety of loosely arranged neurons such that no clear border with
the white matter can be recognized. Field AE is largely comparable to
the field TR as described by Haug (1976), which is similar to the area
semi-annularis according to Stephan (1975).
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