Which of the following is the mucous lining of the uterine cavity?
A. Ectometrium
B. Endometrium
C. Perimetrium
D. Myometrium
Correct Answer: B. Endometrium
Explanation: The mucous lining of the uterine cavity is the endometrium**
The inner lining of the uterus consists of two main layers:
• Endometrium: the functional mucous membrane that lines the uterine cavity itself; it thickens and sheds during the menstrual cycle and is the site of implantation during pregnancy.
• Myometrium: the thick muscular middle layer (not mucous).
• Perimetrium: the outer serous layer.
So, the correct answer is endometrium.
Other Options Details
The question appears to be from an anatomy multiple-choice quiz about the layers of the uterus. Typically, the question asks something like “Which layer of the uterus is shed during menstruation?” and the correct answer is **B. Endometrium**.
Here’s a clear description of **all four options** (the three layers of the uterine wall):
A. Ectometrium
This is not a real anatomical term. It is a common distractor (fake option) in some quizzes. There is no layer called “ectometrium” in the uterus. (Note: “ecto-” is sometimes confused with the outer layer, but the correct term for the outer layer is perimetrium.)
B. Endometrium
The innermost layer of the uterus. It is a mucous membrane that thickens every menstrual cycle in preparation for pregnancy. If no implantation occurs, the functional layer of the endometrium is shed during menstruation (this is the layer responsible for menstrual bleeding).
C. Perimetrium
The outermost layer of the uterus. It is a thin serous (serosal) layer, essentially the peritoneum that covers the uterus externally. It provides external covering and support.
D. Myometrium*
The middle layer and the thickest, most muscular layer of the uterine wall. It is composed of smooth muscle. During labor, the myometrium contracts powerfully to expel the baby (this is where labor contractions come from). It also helps control bleeding after delivery by contracting around blood vessels.
Summary of the three real layers (from inside to outside):
Endometrium → Myometrium → Perimetrium
(A. Ectometrium does not exist—it’s a distractor.)
I hope that you liked this article.
Thanks!! 🙏 😊
Writer: Vandita Singh, Lucknow (GS India Nursing Group)