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 wrong way round the accusation was once that of bad eye-sight. Artefacts of assorted kinds have been invoked to give an explanation for the opponent's errors, starting from perceptual results (Mach bands crispening the areal borders) to bad fixation supposedly because of perfusion too quickly (!) after dying. i've got heard so much of this at once from the protagonists' mouths. The polemic used to be no longer resolved however it has mellowed with age and eventually light out. i used to be relieved to work out that Professor Braak elegantly avoids dis cussion of an extrememist guiding principle, that of "hair-sharp" areal limitations, which makes little feel in developmental biology and is beside the point to neurophysiology. It used to be truly dangerous to cortical neuroanatomy, because its negation resulted in the concept that structurally particular components aren't in any respect existent. but, no one may deny the truth of 5 palms on one hand whether the distinct task of each epidermal phone to 1 finger or one other is clearly impossible.
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Extra info for Architectonics of the Human Telencephalic Cortex
Both regions are pulled far apart from each other and reach their greatest expansion either in front of the genu or back of the splenium corporis callosi (H. Braak, 1979c,d) (Figs. 13, 15,34). 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.
We define the allocortex sensu stricto as being totally composed of allocorticallaminae. The number of layers varies considerably from one area to another. A great number of allocortical fields are also marked by a thick plexus of myelinated fibres in the molecular layer - a feature which often allows one to define them macroscopically (Meynert, 1868, 1872). As a rule, some of the allocorticallayers transgress the limits of their parent territories to interdigitate with a set of isocorticallayers.
Rose, 1927a,b). Layer Pre-a is distinguished by islands or lines of nerve cells embedded in the neuropil of the molecular layer. The islands, formed of mediumsized to large nerve cells, vary in size and shape (Figs. 7, 8, 9,10,11). Cell stains reveal polygonal perikarya with coarse Nissl granules and relatively large nuclei. The cell bodies contain a fair number of intensely stained pigment granules which are concentrated in one part of the cytoplasm. Numerous dendrites, each of approximately the same length, are generated from the cell body by way of cone-shaped proximal stems.