THE FINE STRUCTURE OF THE GRANULAR LAYER IN THE HUMAN CEREBELLAR CORTEX

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Abstract
A detailed description is given of the fine structure of the granular layer of the cerebellar cortex of man, as revealed by the electron microscope. The findings are related to the results of light microscope studies. The two main components of the layer, the granule cell and the presumed synaptic fields, the so-called cerebellar glomeruli, are described in detail. No nucleolus is present in the nucleus of the granule cell. The cytoplasm is scanty and contains very few ribonucleo-protein particles. The data available indicate that the cell should be classified as a unit with scanty protein synthesis. The glomerulus appears to be the most important synaptic structure in the layer; the mutual relations of the granule cells provide poor opportunity for axo-somatic contact. The distribution of lipo-fuscin in the granule layer is described. A perinuclear cytoplasmic lipofuscin inclusion in the granule cell was found to be a constant feature.

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