ÿPrimitive gut extends from buccopharyngeal
to cloacal membrane.
lMove toward each other
ÿCardiogenic mesenchyme is originally
rostral, but folding brings it
caudal to buccal membrane.
ÿForegut and hindgut become recognizable
ÿPortion of yolk sac is incoporated
into the embro as bowel.
ÿMidgut remains open.