| OCR Text |
Show 115 differentiation No for serving areas the attacment Vllo the At rior time amniotic embryosc The terminal folds of young embryos of columnar of the assume relative squamous Prior to derm is the As the the of living lateral initially sections the is amnion the ventral stretched until progressively formation of the amniotic of the remainder to after either fuse, or amniotic their separates the At secrete a cuticle the two form the become the very external increase in blastokinesis of homogeneous to cells blasto of Removal blastoderm causes serosa. squamous amnion and serosa to closely appliedg where for a time, one yolk membraneso close adheres portion the the folds, from the separation least at areas except in the caudal region, another formed form. embryonic Soon the versus Transverse embryo expands and the of determined. that poste composed of essentially cuboidal cells. stretching to be and in lateral views seen importance not amnion becomes a be revealed cellso hypodermal musclesQ gastrulation the anterior can could of in the EMBRYONIC MEMBRANES of folds observed was cuticle inside the surface thickness of for the some the serosa begins on its external of the vitelline membrane serosa. time. It surfaceo continues to to This and |
