In a specific region of the embryo, plasma membranes between cells degenerate, creating an ex-tensive cytoplasm filled with multiple nuclei. This region is the:
a. Amnion
b. Cytotrophoblast
c. Decidua basalis
d. Extraembryonic mesenchyme
e. Syncytiotrophoblast
ANS: E
The syncytiotrophoblast portion of the placenta represents many cells that have fused into a large, multinucleated structure.
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