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What are the layers of the uterus?

  • A Mainly a single thick muscular layer surrounding the uterine cavity from end to end, with little inner lining according to standard textbooks
  • B Endometrium (inner lining, shed in menstruation), myometrium (thick muscle layer for contractions), perimetrium (outer serosal covering)
  • C Mainly two distinct layers are present overall, largely lacking any outer serosal covering tissue in general practice as frequently described
  • D Endometrium and serosa mainly are present, with little intervening muscular layer existing between them in most textbook accounts during normal conditions

Correct answer: B. Endometrium (inner lining, shed in menstruation), myometrium (thick muscle layer for contractions), perimetrium (outer serosal covering)

Explanation: The uterus has three layers: (1) Endometrium: inner mucous membrane that undergoes cyclic changes; has functional layer (shed in menstruation) and basal layer (regenerates each cycle). (2) Myometrium: thick smooth muscle; contracts during labor. (3) Perimetrium: outer serosal (peritoneal) covering.

Concept context

Male and female reproductive systems, gametogenesis, fertilization, implantation, pregnancy, and reproductive health.

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