Embriologi Urogenital

EMBRIOLOGI UROGENITAL

Prof Junizaf, SpOG(K)

Divisi uroginekologi Rekonstruksi

Departemen Obstetri dan Ginekologi

Fakultas Kedokteran Universitas Indonesia

Rs. Dr. Cipto Mangunkusumo Jakarta

Figure 2.1 Transverse section of trilaminar germdisc at 10 days postfertilization. Intermediate mesoderm has begun to excavate between endoderm and ectoderm

Figure 2.4 Further folding of the embryo produces foregut and hindgut cavities lined by yolk sac endoderm

Figure 2.2 Cephalocaudal midline section of early embryo. The allantois forms as a diverticulum of the yolk sac projecting into the connecting stalk of the embryo close to the cloacal membrane. The bilaminar disc structure persists at the cranial and caudal ends to produce the buccopharyngeal and cloacal membranes

Figure 2.5 At the end of the fifth week of development (just before the second missed period), downgrowth of mesoderm partitions the cloaca into anterior and posterior compartments. An outbudding of the mesonephric duct induces the development of the metanephric blastema which eventually forms the adult kidney

Figure 2.6 Continued growth of the urogenital septum occurs as the common excretory duct begins its process of assimilation into the wall of the dilated vesico-urethral canal

Figure 2.7 Fusion of the urogenital septum with the cloacal membrane forms the perineal body, separating the anterior urogenital and posterior anal membranes from one another. Anal and urogenital openings are formed by the breakdown of these membranes. The common excretory duct is completely absorbed into the developing bladder, so that the mesonephric and ureteric ducts now have separate openings