Anhui Medical University > intermediate 2.Nephrogenic cord mesoderm Segmented intermediate mesoderm (pronephric system) Its caudal part Vestigal pronephric gradually isolated system from somites, Unsegmented intemmediate mesoderm forming two Vitelline (mesonephric system) duct Mesonephric longitudinal excretory units elevation along the Allantois Mesonephric Duct posterior wall of Cloaca Unsegmented mesoderm (metan ephric system) abdominalcavity urogenital ridge
Anhui Medical University intermediate mesoderm Its caudal part gradually isolated from somites, forming two longitudinal elevation along the posterior wall of abdominal cavity Nephrogenic cord urogenital ridge 2.Nephrogenic cord
Anhui Medical University 3.Urogenital ridge Mesonephros Mesonephric ridge: The outside part of the Vitelline urogenital ridge giving rise to ducty Cut the urinary system line for B Allanto '050 Future Gonadal ridge: nephric urogenital duct sinus (bladder) Parameso. the innerside part giving nephric D Cloaca duct rise to the genital system Future anorectal canal Gonad
Anhui Medical University Mesonephric ridge: The outside part of the urogenital ridge giving rise to the urinary system Gonadal ridge: the innerside part giving rise to the genital system 3. Urogenital ridge
Anhui Medical University >Three sets of kidney occur in embryo developmnet 1)pronephros (2)mesonephros (3)metanephros >Development of Bladder and urethra Cloaca Urogenital sinus >Congenital anomalies of the urinary system
Anhui Medical University Part II Development of Urinary system Three sets of kidney occur in embryo developmnet ( 1)pronephros (2) mesonephros (3) metanephros Development of Bladder and urethra Cloaca Urogenital sinus Congenital anomalies of the urinary system
Anhui Medical University Three sets of kidney systems 1 Pronephros development begins early in fourth week -Pronephros .nonfunctional as a kidney *pronephros attached to Mesonephros pronephric ducts,these ducts are utilized by next set of kidney Cloaca- Metanephros pronephric tubule Metanephric diverticulum Pronephros degenerate in the end of fourth week
Anhui Medical University •pronephric tubule Pronephros degenerate in the end of fourth week Three sets of kidney systems 1 Pronephros •development begins early in fourth week •nonfunctional as a kidney •pronephros attached to pronephric ducts, these ducts are utilized by next set of kidney
Anhui Medical University 2.Mesonephros: Segmented intermediate mesoderm (pronephric system) .Mesonephros begins Vestigial development in mesonephric ridge late in the fourth week Vitelline duct .lie caudal to pronephros Allantois Meso hric syste Cloac Mesonephric duct .large and elongated, Unsegmented mesoderm Ureteric bud (metanephric system) B functional interim,during early embryonic life
Anhui Medical University •lie caudal to pronephros 2. Mesonephros: •Mesonephros begins development in mesonephric ridge late in the fourth week •large and elongated, functional interim, during early embryonic life