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Sperm in vaginal vault after coitus

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    Suarez, A. At coitus, human sperm are deposited into the anterior vagina, where, to avoid vaginal acid and immune responses, they quickly contact cervical mucus and enter the cervix. Cervical mucus filters out sperm with poor morphology and motility and as such only a minority of ejaculated sperm actually enter the cervix. In the uterus, muscular contractions may enhance passage of sperm through the uterine cavity. A few thousand sperm swim through the uterotubal junctions to reach the Fallopian tubes uterine tubes, oviducts where sperm are stored in a reservoir, or at least maintained in a fertile state, by interacting with endosalpingeal oviductal epithelium.
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    Recovery of spermatozoa from human vaginal washings

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    Persistence of spermatozoa in the vagina and cervix

    It is well understood that a myriad of complex steps occur between the time of ejaculation and the union of the haploid number of chromosomes from each partner that results in the final process of fertilization. Consequently, it is easy to imagine the numerous potential problems that can occur at each step, and thus may prevent a successful pregnancy. Often overlooked are the complexities of sperm transport and the steps that must occur in the sperm, a process known as capacitation, before fertilization can occur. These processes of sperm delivery and potentiation are addressed in detail in this chapter. The complex process of sperm transport through the female reproductive tract begins at the time of ejaculation.
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    Persistence of spermatozoa in the vagina and cervix

    PIP: white women were studied to determine how long after intercourse sperm could be found in the lower genital tract, and if there were a relation between coitus and the persistence of sperms and the menstrual cycle. The total number of examinations after intercourse was Coital interval varied from 2 hours to 21 days. Attempts were made to relate the last day of the menstrual period to the day of coitus, and the longest interval encountered was 28 days after the period in a cycle of 33 days. Positive smears for sperm presence were optimally obtained within 48 hours after coitus.
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    Sperm survival, in terms of numbers, motility, viability, and metabolic activity, was studied in vaginal washings obtained daily from 22 healthy, fertile, married women during one complete menstrual cycle. The numbers of sperm counted on Papanicolaou-stained filters were never large compared to the number of sperm in a single ejaculate. Motile sperm were observed in only six of 94 postcoital specimens examined within 12 hours after intercourse.
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