Physiology of cervix


The cervix produces two types of mucus in relation to its own cervical cycle. This assists in understanding its cyclicity and added to these would then be the sign of menstruation and hence we have three signs that can assist in understanding cervical cyclicity. We also add the period of dryness in the cervix when the organ produces no mucus. There are therefore four signs to use in the cervical mucus method.

The chart is used to map out the signs as 1 for menses, 2 for dry, 3 for pap and 4 for eggwhite. Also 5 is for the last day of eggwhite,  which is the day of ovulation.  


Use a clean cloth or tissue to wipe the lips of the vagina at a specific time during the day when it is convenient for you. Some use the morning just after waking up from sleep. Others use other times to avoid false positive results. For example, you must not confuse mucus from vaginal secretion as a result of sexual arousal with that of cervical mucus which flow freely when available, without any stimulus. Also you must treat any form of vaginitis, which may cause discharge as these can give wrong results. Finally, you must test your cervical mucus only when semen which was discharged  as a result of previous intercourse has had the opportunity to clear completely. For example, if you had intercourse the night before, by midday (if we walking about) it should have cleared from the vagina.

Examine the tissue or cloth to see if there is any mucus on it. If none, then you are at the dry period. If there is mucus, see if it is clear or transparent or cloudy. Then touch to see if it stretches and then classify accordingly. Any form of bleeding must be classified as 1 even if it is during the midcycle. Then chart and join the points together later. You will see a pattern similar to this one below, if you have a normal cycle.

 There are very many variations in the normal pattern, including examples of how the chart can be used to identified abnormalities leading to infertility as follows

Normal variations include

  • Late 3 peaks
  • Short luteal phase


The cervix dilated at the end of pregnancy in order to allow delivery. It also becomes effaced. The processes are driven by hormones and they are temporally programmed in relation to the very end of pregnancy.

Female reproductive tract physiology: venoarterial passage and functional portal circulation in the female reproductive tract

Female reproductive cycle









Menstrual cycle and natural fertility signs








Cervix day by day







 Cross section through the cervix; low power








Cervical dilatation














Gross anatomy
Lymphatic drainage
Organ integration
Clinical anatomy






Chemical Pathology

Anatomical pathology




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