In preserved brains, it has a gray color, hence the name gray-haired matter. In contrast to gray matter that is form from neurons and their unmyelinated fibers, the white matter below them is formed preponderantly by myelinated axons interconnecting neurons in different regions of the cerebral cortex with each other and neurons in other parts of the primaeval nervous system.
The surface of the cerebral cortex is folded in macroscopical mammals, such that more than two-thirds of it in the human brain is conceal in the grooves, called sulci. The phylogenetically most recent part of the cerebral cortex, the neocortex (also called isocortex), is differentiated into six horizontal layers; the more antediluvian part of the cerebral cortex, the hippocampus (also called archicortex), has at most triplet cadreular layers, and is divided into sub palm. Neurons in various layers connect vertically to form small microcircuits, called columns. Different neocortical architectonic fields are distinguished upon variations in the thickness of these layers, their predominant cell type and other factors such as neurochemical markers.If you want to ready a full essay, order it on our website: Orderessay
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