In vivo survival of spermatozoa in cervical mucus

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      • 1. Valuable information concerning timing and character of ovulation can be obtained by correlating alterations of cervical mucus with changes in the basal body temperature during the menstrual cycle.
      • 2. Examination of phase lines formed at the interphase between cervical mucus and seminal fluid in vitro gives some indication of the in vivo behavior of these fluids.
      • 3. The consistent absence of spermatozoa from the cervical mucus one day after intercourse or insemination should arouse suspicion about the mucus-semen incompatibility.
      • 4. The presence of many nonmotile and abnormal spermatozoa in cervical mucus 24 hours or longer after intercourse or insemination, in some patients, suggests the possibility that cervical mucus acts as a filter, which prevents ascent of abnormal spermatozoa up the genital tract.
      • 5. Frequently, in vivo spermatozoa survive in cervical mucus for as long as 5 days after insemination or intercourse, and occasionally up to 7 days. Theoretical implications regarding the effectiveness of the “rhythm system” for contraceptive purposes in some women are left to the reader.
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