Stephen J. Schueler, M.D.

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Missed Menstrual Periods Anatomy

To better understand amenorrhea, it helps to understand the anatomy of the uterus and cervix.

The cervix is a short tube that forms the opening and lower part of the uterus. The cervix lies in the top portion of the vagina. Sperm enter through the cervix to combine with an egg in the uterus. A newborn is delivered through the cervix and vagina from the inside of the uterus.

Anatomy examples:

  • The uterus, cervix, and vaginal canal
  • The bladder
  • The fallopian tubes:
    • These paired structures connect each ovary to the uterus
  • The ovaries:
    • One on each side of the uterus. A normal adult ovary is about the size of an unshelled almond
  • Female organs during a pelvic examination

Last Updated: Nov 1, 2008 References
Authors: Stephen J. Schueler, MD; John H. Beckett, MD; D. Scott Gettings, MD
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PubMed Missed Menstrual Periods References
  1. Goodman LR, Warren MP. The female athlete and menstrual function. Curr Opin Obstet Gynecol. 2005 Oct;17(5):466-70. [16141759]
  2. Hoffman B, Bradshaw KD. Delayed puberty and amenorrhea. Semin Reprod Med. 2003 Nov;21(4):353-62. [14724768]
  3. Timmreck LS, Reindollar RH. Contemporary issues in primary amenorrhea. Obstet Gynecol Clin North Am. 2003 Jun;30(2):287-302. [12836721]
  4. Van der Wijden C, Kleijnen J, Van den Berk T. Lactational amenorrhea for family planning. Cochrane Database Syst Rev. 2003;(4):CD001329. [14583931]
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