By Prof. Dr. Heiko Braak (auth.)

This is a well timed opus. so much people now are too younger to recollect the disagreeable ring of a polemic among those that produced "hair-splitting" parcellations of the cortex (to paraphrase certainly one of O. Vogt's favorite expressions) and people who observed the cortex as a homogeneous matrix sus taining the reverberations of EEG waves (to paraphrase Bailey and von Bonin). One camp accused the opposite of manufacturing bogus arrangements with a paint brush, and the opposite direction round the accusation used to be that of negative eye-sight. Artefacts of assorted kinds have been invoked to give an explanation for the opponent's mistakes, starting from perceptual results (Mach bands crispening the areal borders) to negative fixation supposedly as a result of perfusion too quickly (!) after dying. i've got heard such a lot of this at once from the protagonists' mouths. The polemic was once now not resolved however it has mellowed with age and finally pale out. i used to be relieved to determine that Professor Braak elegantly avoids dis cussion of an extrememist guideline, that of "hair-sharp" areal obstacles, which makes little experience in developmental biology and is beside the point to neurophysiology. It used to be truly unsafe to cortical neuroanatomy, in view that its negation ended in the concept structurally detailed parts will not be in any respect existent. but, no one could deny the truth of 5 palms on one hand no matter if the distinct project of each epidermal mobile to 1 finger or one other is clearly impossible.

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Proiso) retrospl. intermed. (proiso) of internal subicular pyramids (Fig. 14). These allocortical structures represent the supracommissural parts of the hippocampal formation (Stephan, 1975). The adjoining periallocortical ectosplenial field (Figs. 14, 15) hardly shows a clear lamination. The molecular layer is filled with myelinated fibres. An outer main stratum (III) can just be distinguished from an inner one which seemingly consists of only the multiform layer (VI). The following proisocortical fields, area retrosplenialis lateralis et intermedia, are frequently regarded as the "heart" of the heterotypical region (Stephan, 1975).

9, 11). Immediately underneath the clear-cut lamina dissecans, which is devoid of nerve cells and rich in tangentially adjusted myelinated fibres (Fig. 11), there follows layer Pri-OI which is mainly composed of wellformed pyramids. In the central fields of the entorhina1 region, the layer is split into a cell-rich Pri- 0101, a cell-sparse Pri-OIj3, and again a cell-rich Pri-OI'Y (Fig. 9). The cell bodies of the pyramids are richly endowed with pigment. The dominating constituents of the layer Pri-j3 are slender pyramidal cells of small size giving rise to a thin apical dendrite and some delicate basal ones.

1 The Retrosplenial Region Most authors agree in the subdivision of the retrosplenial region into a "hypergranular" part which is in continuation with the supracallosal allocortex and an "agranular" one mediating to the isocortex. The granularized zone can be further subdivided into periallocortical and proisocortical parts. Table I gives a synopsis of the nomenclature used by different authors for designation of the retrosplenial areas. The retrosplenial core fields rarely extend on to the free surface of the cingulate gyrus.