Cervical Glaire

The cervical glaire is a secretion produced by glands of the cervical channel in pre-ovulatoire period. It provides several functions:

to protect the spermatozoa against the hostile conditions from the vagina
to condemn the uterine cavity apart from the period ovulatoire
to provide an energy supplement to the spermatozoa.

For the period of sterility, the cervical glaire blocks the collar of the Utérus and presents a tight grid of proteinic filaments , which immobilizes the Spermatozoïde S. At the time of the period of fruitfulness, the cervical glaire becomes permeable with the spermatozoa thanks to a relaxation of the grid, but stops the spermatozoa all the same having important malformations. These modifications of the structure of the glaire are subjected to the variations of the plasmatic rates of the hormones ovariennes (estrogen S and Progestérone).

In the neighborhoods of the period of ovulation, the cervical glaire becomes abundant, of relatively low viscosity (compared to the other periods), and of an alkaline pH for the survival of the spermatozoa.

The autoobservation of the cervical glaire is at the base of a natural method of spacing of the births, the Méthode Billings (see this term).

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