What embryonic structure gives rise to the renal collecting system?

The renal collecting system originates from the mesonephric duct, specifically from the portion that develops into the ureteric bud. During embryonic development, the mesonephric duct, also known as the Wolffian duct, plays a crucial role in the formation of the urinary system. As the mesonephric duct develops, it gives rise to the ureteric bud that will eventually branch out and form the entire collecting system of the kidney, including the renal pelvis, calyces, and collecting ducts.

This differentiation is essential for establishing a functional urinary system, as the collecting system is responsible for transporting urine from the renal pyramids to the bladder. Understanding the embryonic origins of these structures helps clarify the processes involved in congenital abnormalities of the urinary tract that may arise from improper development of the mesonephric duct and its derivatives.

The other structures mentioned do not contribute directly to the renal collecting system. The Müllerian duct is involved in the development of female reproductive structures, the urogenital sinus contributes to the formation of the bladder and urethra, and the urogenital folds are involved in the development of external genitalia.