Key words or phrases include chorion, allantois
, yolk sac, amnion, placenta, and umbilical cord.
The mesoderm also contributes to formation of the amnion and allantois
is an endermal diverticulum that communicates with the cloaca (hind-gut).
2] muscle, metanephros, epithelial tissue, fetal membranes, connective tissue, nervous tissue, allantois
, bone marrow, olfactory bulb) Developmental 363 4.
The intra-embryonic cloaca, destined to become the bladder, is connected to the extra-embryonic allantois
derived from the caudal end of the yolk sac through the urachus.