Question

Chorion is composed of

• A. Cytotrophoderm
• B. Syncytial trophoblast
• C. Outer ectoderm and somatic mesoderm
• D. All the above

Answer 1

Answer: (C)

Chorion is the outermost extra embryonic membrane of amniotes enclosing the embryo and all its other membranes. Chorion is one of the fetal membranes formed during embryonic developmental period between the developing the fetus and the mother. It is formed by extraembryonic mesoderm and the two layers of trophoblast that surround the embryo and other membranes.