Answer: Endometrium (inner lining, shed in menstruation), myometrium (thick muscle layer for contractions), perimetrium (outer serosal covering).
- 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.
The human male reproductive system: sperm formed in the testis mature in the epididymis and travel via the vas deferens, mixing with secretions of the seminal vesicle, prostate and bulbourethral glands. Image: Wumingbai, CC BY-SA 4.0, via Wikimedia Commons.
Concept context
Male and female reproductive systems, gametogenesis, fertilization, implantation, pregnancy, and reproductive health.