Human brain mapping impact7/8/2023 In contrast, the primary motor (BA4), somatosensory (BA3), and visual (BA17) cortices display larger pyramidal cells in layer V than III. This cytoarchitectonic feature is called ‘externopyramidization’ and typical for higher unimodal (BA18 as an example in the visual system) and multimodal (examples BA7 and BA39) areas. Bottom: Higher magnifications of the original micrographs ( A– H) demonstrate the larger (or at least equally large) pyramidal cells in layer III compared with those cells in layer V. ( H) Area frontalis agranularis BA6, premotor cortex. ![]() ( G) Area postcentralis oralis BA3, primary somatosensory cortex. ( F) Transition from BA4 to BA3, (primary motor to primary somatosensory cortex). inf = angularis BA39, temporo-occipital cortex. ![]() ant = supramarg BA40, inferior parietal cortex. ( B) Praeoccipitalis BA19 (higher visual cortex). Transcriptions of Brodmann’s hand writing: ( A) Area occipitalis BA18, secondary visual cortex at the transition to BA17. Original micrographs of human cortical areas by K.
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