Embryonic Disc

The embryonic disc is one of the organs of embryonic development that is formed during the formation of the organism. It is an important element of the internal structure of the embryo and performs many functions for the normal development of the embryo.

The germinal disc is a conical protrusion of the peritoneum from below, limited anteriorly by the perforating ligament of the fetal liver. On the sagittal plane in front behind it lies the liver. Serves to attach the peritoneum of the entire anterior section of the embryo to the liver capsule and to the liver parenchyma. The perforating ligament lies between the edge of the germinal disc and the bottom of the gallbladder. Between the upper pole of the disc and the visceral plate of the second cotyledon passes the vitelline duct of the embryo, which flows successively into the funnel of the yolk sac - then into the bile sac, then into the yolk vesicle, which ends the branching of the yolk sac at the bottom. At a short distance posterior to the upper border of the disc, near the site of nephron formation, between it and the superficial layer of the visceral layer of the first mesodermal layer of the future liver, a plexus of two embryonic formations is wedged: the primary fetal kidney and the ureter. These two vessels run forward parallel to each other or touch at the anterior end of both. Later, urine passes through the opening between these formations into the gallbladder or, bypassing it, pours out through special tubes between the visceral layer of the second mesodermal layer, and in the posterior sections, the intermediate layer with the intestinal tube. After the birth of the body, the primary kidney experiences a reverse development: first, in an adult, the layer of connective tissue between the kidney parenchyma and the rest disappears.