EDUCATION (CBSE/UGC NET)

Detailed explanation-1: -Fusion of the urogenital swellings with primary luminization gives rise to the penile urethra, whereas the glandular part of the urethra is formed through secondary luminization of the epithelial cord that is formed during fusion of the arms of the genital tubercle, i.e., the glans.

Detailed explanation-2: -The female urethra develops from the endoderm and the surrounding splanchnic mesoderm of the urogenital sinus. At 7 weeks’ gestation, the cloaca divides into the urogenital sinus and the rectum with the development of the urorectal septum.

Detailed explanation-3: -Bladder and Ureter Development The development of the bladder begins during week four when the urogenital septum divides the cloaca into two parts, the rectum posteriorly and the urogenital sinus anteriorly. The urogenital sinus will continue to grow to form the bladder, with the inferior end forming the urethra.

Detailed explanation-4: -The urogenital system arises from intermediate mesoderm which forms a urogenital ridge on either side of the aorta. The urogenital ridge develops into three sets of tubular nephric structures (from head to tail): the pronephros, the mesonephros, and the metanephros.