493x335_cervixThe Cervix is an important area of the Female Reproduction System.

It is part of the Uterus on the lower portion where it follows into the Vagina.

It is circular and cylindrical in shape and it attaches through the upper anterior portion of the vaginal wall.

Only 1/2 is visible in the vaginal region when viewed during a medical examination.



  • The Cervix opens to allow sperm to pass into the uterus.
  • During orgasm, the Cervix convulses and the External Os dilates.
  • The Cervix opens to allow menstrual fluid to pass through
  • The Endometrium during the menstrual period is shed.
  • The Cervix opens and this is believed to be the cramping pain that many women experience.
  • The Cervix dilates and opens to allow an infant to pass from the Uterus during Childbirth.
  • The Cervix will dilate to 10 cm.


Anatomy of the Cervix

1.)  Ectocervix

  • Also called the portio vaginalis
  • This portion is found in the vagina

2.) External os

  • This is the circular opening of the Ectocervix
  • The shape of the opening will change on age [minor] and previous vaginal birth [major]

3.) Endocervical canal

  • Passageway between the uterus and vagina

4.) Internal os

  • This is the opening prior to entrance into the endocervical canal


Cervical fluid

  • This mucus that blocks the external os during menstruation
  • This blocks sperm from entering the uterus
  • However, during ovulation “other” mucus is formed that allows sperm to be guided into uterus.


Medical Conditions that Affect the Cervix

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