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By E.D.P. De Robertis and R. Carrea (Eds.)

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ROBERTSON, W. , (1900a); A microscopic demonstration of the normal and pathological histology of mesoglia cells. J. ment. , 46, 733-752. W. , (1900b); A Textbook of Parhology in Relation to Mental Diseases. Edinburgh, ROBERTSON, William F. Clay. , (1894); Die morphologische und histologische Entwicklung des Kleinhirn der Teleostier. Morph. Jb. , (1897); Die fruhesten Differenzierungsvorgange im Central-nervensystem. Arch. -Mech. , 5, 81-132. SCHEIBEL, M. , AND SCHEIBEL, A. , (1958); Neurons and neuroglia cells as seen with the light microscope.

Fig. 22. Low-power micrograph of a sympathetic ganglion in which the perisomatic and peridendritic glial cells are shown. ) References p . 33134 30 M. P O L A K Fig. 23. Perisomatic and peridendritic glial cells with their typical morphological characteristics in a sympathetic ganglion. ) Hortega developed a special modification of the ammoniacal silver-carbonate method to show the processes and other histological characteristics of these cells. The perisomatic glial cells, all of which are endocapsular, are arranged around the neuronal ceU body.

Laminar glial cells with reticular cytoplasm are sometimes seen in the same preparations. Tbeperiexpansional glial cells are poor in branches. These cells, often called spirocytes; have one or two branches arranged as spirals around the neurons. From a functional point of view it seems conceivablethat the sympatheticneuroglia is identical to the central glia, taking part perhaps in the metabolic activity of the sympathetic neurons. In the visceral sympathetic plexus, the characteristics of the neuroglia are similar to the ones just described.

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