Textbook of normal histology: including an account of the development of the tissues and of the organs . rils resulting from the subdivisionof the protoplasmic processes of thesecells, it is highly probable that thefibrils terminate without unitingwith one another. From the blunt,central end of the cell the axis-cyl-inder process extends into the whitematter, where it becomes continuouswith a nerve-fibre. These axis-cyl-inder prolongations give off recurrentcollateral processes, which bendtowards the periphery. The pyrami-dal body of the cell contains a largeround or oval nucleus, with a dis-t
Textbook of normal histology: including an account of the development of the tissues and of the organs . rils resulting from the subdivisionof the protoplasmic processes of thesecells, it is highly probable that thefibrils terminate without unitingwith one another. From the blunt,central end of the cell the axis-cyl-inder process extends into the whitematter, where it becomes continuouswith a nerve-fibre. These axis-cyl-inder prolongations give off recurrentcollateral processes, which bendtowards the periphery. The pyrami-dal body of the cell contains a largeround or oval nucleus, with a dis-tinct nucleolus, embedded within afinely granular protoplasm, masses ofbrownish pigment almost always occupying the base of the larger pyramidal cells are surrounded by pericellular lymph-spaces, which probably communicate with the extensions of thesubarachnoidean space continued with the prolongations of thepia accompanying the blood-vessels within the cerebral tissue. 4. The fourth layer embraces a closely-packed zone (. mm.)composed of small, irregular, oval or angular nerve-cells, 7-. Section of cerebral cortex (motor area)of child stained by Golgis silver method :A, layer of neuroglia-cells; B, layer ofsmall pyramidal ganglion-cells ; C, layerof large pyramidal cells; D, layer of ir-regular smaller cells. 3M NORMAL HISTOLOGY. 14 ix in diameter ; among the smaller elements a few larger pyramidalcells are often encountered, as well as radiating bundles of med-ullated nerve-fibres. The cells of this layer resemble those ofthe second, since their axis-cylinder processes are confined to the gray matter, the elements be-cells of the Fig. 343. ing, therefore,second type. 5. The fifth layer indicatesthe proximity of the whitematter by the large areas occu-pied by bundles of radiatingnerve-fibres directly contin-uous with the medullary tracts ;within the interspaces betweenthe nerve-bundles lie the smalland medium - sized cells,spindle to pyramidal in form,which charact
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