Multiple choice

Yolk sac placenta is derived from

  1. yolk sac and allantois

  2. yolk sac and chorion

  3. yolk sac and amnion

  4. yolk sac only

  5. -
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Chorion is the outermost of the two fetal membranes (the amnion is the innermost) that surround the embryo. The chorion develops villi. Yolk sac placenta develops both from yolk sac and chorion.

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