Which layer of the uterus is responsible for labor and delivery?
a. Myometrium
b. Endometrium
c. Perimetrium
d. Epimetrium
ANS: A
The outermost layer of the uterine wall is the perimetrium, a fold of the visceral peritoneum. The myometrium is the middle, smooth muscle layer. During pregnancy, these cells increase in size to accommodate the growing fetus, and during labor and delivery, oxytocin causes coordinated contractions of this middle layer to expel the fetus. The lining of the uterus is called the endometrium and is a highly vascular mucous membrane, part of which is lost and regenerated with each menstrual cycle. During pregnancy, the endometrium helps in forming the maternal side of the placenta.
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