A female patient complains of severe menstrual cramps. Which uterine structure should the nurse recognize is responsible for the patient's complaint?
1. perimetrium
2. myometrium
3. endometrium
4. cervix
Correct Answer: 2
The myometrium is the middle layer and makes up most of the uterine wall. This layer has muscle fibers that run in various directions and allow contractions during menstruation or childbirth and expansion as the fetus grows. Neither the perimetrium, a serous layer, nor the endometrium, the innermost layer that is shed during menstruation, has muscle that can contract and cause pain. The cervix is the pathway between the vagina and the uterus and is not the area of muscle contraction that causes menstrual cramps.
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