Architectonics of the Human Telencephalic Cortex by Prof. Dr. Heiko Braak (auth.)

By Prof. Dr. Heiko Braak (auth.)

This is a well timed opus. such a lot 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 considered 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 was once that of bad eye-sight. Artefacts of varied types have been invoked to give an explanation for the opponent's blunders, starting from perceptual results (Mach bands crispening the areal borders) to terrible fixation supposedly because of perfusion too quickly (!) after demise. i've got heard so much of this at once from the protagonists' mouths. The polemic was once now not resolved however it has mellowed with age and eventually light out. i used to be relieved to determine that Professor Braak elegantly avoids dis­ cussion of an extrememist guideline, that of "hair-sharp" areal limitations, which makes little experience in developmental biology and is beside the point to neurophysiology. It was once really damaging to cortical neuroanatomy, due to the fact its negation resulted in the concept that structurally certain parts should not in any respect existent. but, not anyone may deny the truth of 5 palms on one hand no matter if the unique task of each epidermal phone to 1 finger or one other is clearly impossible.

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Example text

The multiform layer (YI) is continuous with the deep layer found already in the ectosplenial field. It shows clear-cut upper and lower boundaries. The border towards the periallocortex is marked by the sudden appearance of richly pigmented constituents. In pigment preparations, Pvr is the most intensely stained layer of the retrosplenial cortex. Both retrosplenial areas show an almost astriate character because of the high myelin content of the deep laminae. The intermediate retrosplenial area differs from the lateral one in that the molecular layer is less rich in myelinated fibres.

Ontogenetically they show an almost uniform development and share therefore general principles of structure. The allocortical areas which comprise the remaining parts of the cortex display rather marked differences of structure. Allocortical areas range from simply organized fields to highly refined ones with a greater number of laminae than is commonly seen in isocortical areas. The partly extended stretch of cortex mediating between the allocortex and the isocortex is often difficult to classify.

This marginal zone is designated the proisocortex. Isocortical areas generally display an euradiate characteristic whereas proisocortical fields may also show the infraradiate or supraradiate type. But unfortunately, there is no clear criterion for defining the boundary of the proisocortex with the isocortex sensu stricto. The total transitional zone including the periallocortex and the proisocortex is often referred to as the meso cortex (M. Rose, 1927a,b; Brockhaus, 1940; Kirsche: mesoneocortex, 1974; Stephan, 1975).

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