Which is the correct outer-to-inner sequence of the uterine layers?

Which is the correct outer-to-inner sequence of the uterine layers?

• A. Perimetrium, Endometrium, Myometrium
• B. Endometrium, Myometrium, Perimetrium
• C. Myometrium, Endometrium, Perimetrium
• D. Perimetrium, Myometrium, Endometrium

Answer: (D)

The uterus is organized from outside to inside as the perimetrium, the myometrium, and then the endometrium. The perimetrium is the outer protective layer, the myometrium is the thick middle layer of smooth muscle that contracts during menstruation and labor, and the endometrium is the inner lining that thickens to support a possible pregnancy and sheds if implantation doesn’t occur. This outer-to-inner arrangement—perimetrium, then myometrium, then endometrium—is why that sequence is correct.

The uterus is organized from outside to inside as the perimetrium, the myometrium, and then the endometrium. The perimetrium is the outer protective layer, the myometrium is the thick middle layer of smooth muscle that contracts during menstruation and labor, and the endometrium is the inner lining that thickens to support a possible pregnancy and sheds if implantation doesn’t occur. This outer-to-inner arrangement—perimetrium, then myometrium, then endometrium—is why that sequence is correct.