Atlas of Human Embryos Figure 3-3

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amniotic cavity, cloacal membrane, connecting stalk, cut edge of amnion, extra-embryonic coelom, lateral body fold, neural fold, neural groove, neural plate, primitive groove, primitive node, primitive pit, umbilical vesicle

A dorsal view of the presomite embryo in the early neural groove period showing midline specializations in the ectoderm and the relation of the embryo to the amnion (cut), yolk sac and connecting stalk. The lateral body folds give the embryo "sides." [printable version of FIG 3-3]

The presomite embryo with a notochordal canal
Stage 8
Age 18 days
Carnegie collection 5960

Heuser CH: A presomite human embryo with a definite chordal canal. Contrib Embryol Carnegie Instn 23:251â€“267, 1932.

Keywords: amniotic cavity, cloacal membrane, connecting stalk, cut edge of amnion, extra-embryonic coelom, lateral body fold, neural fold, neural groove, neural plate, primitive groove, primitive node, primitive pit, umbilical vesicle

Source: Atlas of Human Embryos.

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