By Prof. Dr. Sanford L. Palay, Dr. Victoria Chan-Palay (auth.)
The origins of this e-book return to the 1st electron microscopic experiences of the crucial worried process. The cerebellar cortex was once from the 1st an item of shut learn within the electron microscope, repeating in glossy cytology and neuroanatomy the function it had within the palms of RAMON y CAJAL on the finish of the 19th century. The senior writer vividly recollects an afternoon early in 1953 whilst GEORGE PALADE, with whom he was once then operating, confirmed him an electron micrograph of a cerebellar glomerulus, asserting "That is what the synapse should still seem like. " it's actual that the tissue used to be swollen and the mitochondria have been exploded, yet all the necessities of synaptic constitution have been noticeable. at the moment small fragments of tissue, fastened by way of immersion in osmium tetroxide and embedded in methacrylate, have been laboriously sectioned with glass knives with none predetermined orientation after which tested within the electron microscope. After a lot looking, favorably preserved parts' have been studied on the cytological point for you to realize the components of neurons and signify them. Such tactics, established upon random sections and uncontrollable choice by way of a hugely erratic means of maintenance, precluded any systematic research of the association of a selected nucleus or zone of the critical fearful approach. It was once tricky sufficient to differentiate neurons from the neuroglia.
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Lobule V. x 64500 matrix (PALAY and PALADE, 1955; PETERS, PALAY, and WEBSTER, 1970). The most variable component of this complex is, of course, the endoplasmic reticulum. The diverse arrangements of this organelle in the Nissl substance of an individual Purkinje cell often encompass the entire gamut of variations that can be encountered in the nervous system. The most highly ordered arrays are usually found in large masses located near the nucleus and making up the nuclear cap (Figs. 11-15), but they are not restricted to this region.
The cat appears to have a very strong tendency for large single heterochromatin bodies to occur in the female (BARR, BERTRAM, and LINDSAY, 1950), but almost 60 % of the cells show no sex difference. In the rat nearly 80% of the Purkinje cells have some kind of nucleolus-associated chromatin in the female, whereas in the male only about 30 % of the cells display this feature. Such percentages suggest that the differences are less related to sex than to some metabolic cycle of the Purkinje cell and its nucleus.
The similarity between these two cells is impressive. Even the total lengths of the dendritic trees are almost identical (10622 and 10978 11m, respectively). 8 % in the other. The number of thorns per cell recorded in our study is more than twice the number obtained by SMOLYANINOV (1971) in the same species, but is only about one fourth the number reported by PALKOVITS et al. (1971 c) in the cat. Both the density of thorns (number per unit length of dendrite) and the total length of the spiny dendrites are greater in the cat.