Century Dictionary and Cyclopedia
- Not forming a part of the embryo proper; specifically, noting that portion of the vertebrate embryo which lies outside of the umbilical stalk.
“A trophectoderm is: The extra-embryonic part of the ectoderm of mammalian embryos at the blastocyst stage before the mesoderm becomes associated with the ectoderm.”
“The finding that these extra-embryonic transplants elicited the same effects as the intraembryonic grafts gave definite evidence for the diffusible nature of tumoral nerve growth promoting factor.”
“The space between the amnion and the serosa constitutes the extra-embryonic celom, and for a time communicates with the embryonic celom.”
“Its dorsal surface is covered by the amnion, while its ventral surface is bounded by the extra-embryonic celom, and is in contact with the vitelline duct and yolk-sac.”
“The lateral leaves of somatopleure then grow round on each side, and, meeting on the ventral aspect of the allantois, enclose the vitelline duct and vessels, together with a part of the extra-embryonic celom; the latter is ultimately obliterated.”
“This fluid increases in quantity and causes the amnion to expand and ultimately to adhere to the inner surface of the chorion, so that the extra-embryonic part of the celom is obliterated.”
“In reptiles, birds, and many mammals the allantois becomes expanded into a vesicle which projects into the extra-embryonic celom.”
“The rudiment of the umbilical cord is represented by the tissue which connects the rapidly growing embryo with the extra-embryonic area of the ovum.”
“In the human embryo described by Peters the mesoderm outside the embryonic disk is split into two layers enclosing an extra-embryonic clom; there is no trace of an intra-embryonic clom.”
“The two cavities in the general mesoderm unite on the ventral aspect of the gut and form the pleuro-peritoneal cavity, which becomes continuous with the remains of the extra-embryonic celom around the umbilicus; the two cavities in the pericardial area rapidly join to form a single pericardial cavity, and this from two lateral diverticula extend caudalward to open into the pleuro-peritoneal cavity (Fig. 54).”
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