ZOO 3713C Lecture Notes - Lecture 13: Mesonephric Duct, Pronephric Duct, Renal Corpuscle
Document Summary
Indifferent stage of sexual differentiation: genetic vs. environmental factors. Renal cortex: renal corpuscle, convoluted tubules. Renal medulla: collecting ducts, loop of henle. Each minor calyx drains a tree of collecting ducts within a renal pyramid. Pyramids are separated by columns of cortical tissues called renal columns. The renal pyramids converge to form the renal papilla. Early development 3 successive stages: pronephros, mesonephros, metanephros. Pronephros most primitive kidney: cervical nephrotomes 507 pairs of small hollow balls of epithelium connected to the primary nephric duct ( pronephric duct) Transient nephrotomes degenerates by 24-25 days. Primary nephric duct extends caudally to become the mesonephric duct. Mesonephronic tubules form in each segment: cranial to caudal sequence, first 4-6 bud out from the primary nephric duct, remaining form in the intermediate mesoderm and connect with the mesonephric duct. Mesonephric tubule differentiates a cup-shaped bowman"s capsule that wraps around the wraps around the glomerulus. Bowman"s capsule and glomerulus make up the renal corpuscle.
