Figure 27.

Individual variability in the anterior hippocampus 2. Example of a common morphological characteristic in the anterior hippocampus whereby after initial bending of the lateral external digitation (‘*’ in (b)), another digitation emerges laterally when moving in a posterior direction (‘^’ in 27(c)). This can make delineation of the CA1 region confusing. In these cases, we recommend considering both digitations to contain ‘typical’ CA1 as, when moving posteriorly, they generally merge to create a single digitation which becomes the dorsal wall of the body of the hippocampus (see Figure 27(h)). ‘a’ represents the anterior-most slice, with each subsequent panel (‘b’–‘h’) representing a contiguous slice in the posterior direction.