kidney cortex. medullary rays

anatomical anatomy are biology body bundles collecting coming comprises convoluted cortex crossing define drain duct ferrein glomerulus hematoxylineosin histological histology human kidney light lobule lobules low magnification medulla medullary micrograph microscope microscopic microscopy nephron nephrons parallel parenchyma portion pyramid ray rays renal serve showing stained their they tubule tubules urinary urine vertically which whose