What Does the Anatomical Organization of the Entorhinal Cortex Tell Us?
Figure 1
Schematic representation of the overall organization of the
entorhinal cortex and its connectivity. (a) Position of the
entorhinal cortex and surrounding cortices and hippocampus in the
rat left hemisphere. Indicated are the dorsoventral extent of the
hippocampus, positions of LEC and MEC, and the approximate position
of a representative horizontal section, illustrated in (b). (b)
Horizontal section illustrating entorhinal-hippocampal
connectivity (see text for more details). (c) and (d) Representation of the
topographical arrangement of entorhinal-hippocampal reciprocal
connections. A dorsolateral band of entorhinal cortex (magenta) is
preferentially connected to the dorsal hippocampus. Increasingly,
more ventral and medial bands of entorhinal cortex (purple to
blue) are connected to increasingly more ventral levels of the
hippocampus. Yellow line in (c) indicates the border between LEC
and MEC. (e) Enlarged entorhinal cortex, taken from (c), indicating
the main connectivity of different portions of entorhinal cortex.
Brain areas preferentially connected to LEC are printed in green,
those connected to MEC are in magenta. The color of the arrows
indicates preferential connectivity to the
dorsolateral-toventromedial bands of entorhinal cortex (magenta or
blue, resp.) or that no preferential gradient is present
(green).