Agranular Area of the Cerebral Cortex
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
This 1930s Soviet encyclopedia article describes the agranular region of the cerebral cortex, characterized by the absence of both granular layers (II and IV). It notes that medium and small pyramidal cells replace these layers, causing the boundaries between them and the third and fifth layers to merge, notably found in the precentral region.
Encyclopedia entry (1928–1936)
AGRANULAR AREA OF THE CEREBRAL CORTEX, is characterized by the absence of both granular layers (II and IV), in place of which medium and small pyramidal cells are seen, as a result of which the sharpness of the boundaries between them and layers III and V disappears. Such a structure of the cortex is found in the precentral region (area giganto-pyramidalis and area frontalis agranularis), areas 4 and 6 according to Brodmann, FA and FB according to Economo-Koskinas (see Cerebral Cortex Architectonics).
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“Agranular Area of the Cerebral Cortex.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/agranular-area-of-the-cerebral-cortex/