All biological tubules [internal linings - convoluted or straight] are made from the same Epithelial Cells that also comprise Our Integument - or Skin.
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Each testis is made up of abut 700 to 900 highly convoluted seminiferous tubules which leads to single highly convoluted Epididymis. Both of them are about 6 meters long, leading to Vas Differ-ens.
Casts are formed in the distal convoluted tubules and collecting ducts of the nephron in the kidney. They are made up of protein or cellular material that becomes trapped in the renal tubules and is then washed out into the urine, where they can be detected.
Nephrons
The epithelial tissue in the renal tubules is typically simple cuboidal or simple columnar, allowing for absorption, secretion, and filtration of substances. The cells are tightly packed together with microvilli and mitochondria to increase surface area for efficient reabsorption and secretion of substances as needed for kidney function. Additionally, the tight junctions between the cells help regulate the movement of substances across the tubules.
Embryonic cells make up a plant