has part has_part characteristic of inheres_in has modifier qualifier thin cerebellar granule layer abnormal decreased thickness granular layer of cerebellar cortex decreased size of the central nervous system cell part cluster decreased size of the central nervous system gray matter layer decreased thickness of the granular layer of cerebellar cortex thinned granular layer of cerebellar cortex A decrease in the thickness of the granular layer of cerebellar cortex. decreased thickness of the anatomical entity anatomical entity morphology in the brain phenotype cerebellar layer morphology phenotype