- 妮妮媽Lv 51 decade agoFavorite Answer
The supranuclear cytoplasm is the region that contains an abundant endocytotic apparatus in nonciliated cells. But the supranuclear cytoplasm of ciliated cells is penetrated by particularly long cilial rootlets which are surrounded by numerous elongate mitochondria.
its function is not clearly defined. it is likely a cytological reservoir.