Fig. 2.
(a) The marking scheme used in the study. The inset shows a diagram of the hippocampal subfield derived from a histological specimen (adapted from Ref. [5]). As it is not possible to identify individual hippocampal layers at this field strength, the scheme was based on reliably recognizable anatomical landmarks even though this resulted in a part of the prosubiculum and subiculum proper being counted towards the CA1 sector. (b) A typical example of hippocampal subfield markings. No. 1 is the most anterior slice, No. 5 is the most posterior slice. Slice 3 is the referred in the text as “starting” slice. The arrow on slice 5 indicates a cyst in the vestigial hippocampal sulcus which was excluded from the measurement.