Download PDF by Prof. Dr. Heiko Braak (auth.): Architectonics of the Human Telencephalic Cortex
By Prof. Dr. Heiko Braak (auth.)
This is a well timed opus. so much folks now are too younger to recollect the disagreeable ring of a polemic among those that produced "hair-splitting" parcellations of the cortex (to paraphrase one among 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 used to be that of terrible eye-sight. Artefacts of varied kinds have been invoked to give an explanation for the opponent's blunders, 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 without delay from the protagonists' mouths. The polemic was once no longer resolved however it has mellowed with age and finally pale 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 experience in developmental biology and is inappropriate to neurophysiology. It used to be truly hazardous to cortical neuroanatomy, in view that its negation ended in the concept structurally unique parts usually are not in any respect existent. but, no one could deny the truth of 5 arms on one hand whether the certain project of each epidermal mobile to at least one finger or one other is clearly impossible.
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Extra resources for Architectonics of the Human Telencephalic Cortex
The medial parts of the subregion are devoid of subicular pyramidal layers and show only the parvopyramidallayer and the entorhinal derivatives Pri--y and Pri-,B in area presubicularis medialis caudatis (pr mc' Fig. 12) or additional to these layers rather thinly sketched Pre--y and Pre-,B in area presubicularis medialis oralis (pr mo ' Figs. 7, 12). 2 The Parasubicular Subregion The parasubiculum is distinguished by a marked and abrupt change of the parvopyramidallayer: the dominant pyramidal cells show an increase in average cell size and keep larger distances between each other.
The third sector (CA3) shows a unifold layer of well-formed and regularly oriented pyramids. The hallmark of these cells is long microdendrites which cover confined portions of both the apical and the basal dendrites. The microdendrites are sites of contact with the mossy fibres. As a result of the regular arrangement of the CA3-pyramids the molecular layer can be further divided into a substratum radiatum (Meynert, 1868) harbouring 30 The Allocortex terminal ramifications of the mossy fibre system, a substratum lacunosum formed of the finer dendritic twigs which are studded with spines of the common type, and a substratum eumoleculare (Stephan, 1975) enclosing the endbranches of the apical dendrites.
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. The dendrites give off side branches in great numbers and are richly invested with spines. They can issue from any point of the cell body and form in this way a globular dendritic domain.