👉 A tubulus is a type of fibrous structure that is commonly found in the inner lining of the urinary system, typically around the bladder. These structures are primarily composed of connective tissue and can be classified into two main types: primary tubules (also known as nephrons) and secondary tubules (also known as glomeruli). Primary tubules are responsible for filtering waste products from the blood and delivering them to the kidneys; they consist of a single layer of epithelial cells, which