Cervix

The cervix (from Latin "neck") is actually the lower, narrow portion of the uterus where it joins with the top end of the vagina. It is cylindrical or conical in shape and protrudes through the upper anterior vaginal wall. Approximately half its length is visible with appropriate medical equipment; the remainder lies above the vagina beyond view.

Cervical Mucus

Normally the external os is blocked by a thick mucus that prevents infection, however the mucus thins when ovum are ready to be fertilized, allowing spermatazoa to pass through the cervix. Most oral contraceptives increase their effectiveness by not allowing this mucus to thin, therefore blocking spermatazoa from passing even when ovum are ready to be fertilized. During pregnancy the cervix is completely blocked by a special antibacterial mucosal plug which prevents infection as before. The mucous plug comes out as the cervix dialates in labor or shortly before.

Related Topics:
Mucus - Infection - Ovum - Spermatazoa - Oral contraceptive

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