Collecting ducts are made of several connecting tubules joined together in cortical medullary rays of simple cuboidal epithelium. These ducts then further merge to become larger and straighter.

The fibromuscular tube that transports urine from the bladder and outside the body is the urethra. It has a mixture of epithelial lining of stratified columnar, pseudostratified columnar, and stratified squamous epithelia.

The renal corpuscle is made up of glomeruli, small constructs of capillaries, inside a glomerular capsule. The glomerulus filters blood which enters it through afferent and efferent arterioles.

Reference:
Mescher, A. (2018a). Junqueira’s Basic Histology: Text and Atlas, Fifteenth Edition (15th ed.) [E-book]. McGraw Hill / Medical.