ÿEmbryonic disc grows faster in
length than the yolk sac
causing the embryo to
bend.
lDorsal surface grows more rapidly than
the ventral
ÿLateral folding
lFusion with apposing side except in
the region of the yolk sac,
and allantois
ÿFolding brings the heart and septum
transversum caudal to
bucco-pharyngeal
membrane.