Question

The covering of an omphalocele is derived from which layer?

• A. Amnion
• B. Chorion
• C. Mesoderm
• D. Endoderm

Hint:

When studying congenital abnormalities, remember that the amnion is involved in the protection and development of structures in the abdominal area.

Answer 1

The Correct Option is A

An omphalocele is a congenital defect in which the abdominal organs protrude outside of the body through the umbilical opening. The key characteristic of an omphalocele is that these organs are covered by a protective layer. The question at hand is regarding the origin of this covering layer. The options provided are:

• Amnion
• Chorion
• Mesoderm
• Endoderm

The correct answer is that the covering of an omphalocele is derived from the amnion.

Explanation: During fetal development, the amnion is one of the extra-embryonic membranes that envelops the developing fetus. Specifically, in the case of an omphalocele, the amniotic membrane provides a protective sac covering the herniated organs outside of the abdominal cavity. Unlike other potential coverings like the chorion (which forms the outermost membrane and contributes to the placenta), the mesoderm (which is a middle layer in embryonic development), or the endoderm (which forms the lining of the gut and associated structures), it is the amnion that directly encloses and provides a barrier for the exposed organs in an omphalocele.