amniotic fold
http://purl.obolibrary.org/obo/UBERON_0005971
A sheet of somatopleure that grows upward over the embryo and eventually meets in the midline enclosing the embryo, eventually giving rise to the amnion and chorion[Kardong]. [ http://openisbn.com/search.php?q=0073040584&isbn=1/ ]
Synonyms: amnionic fold