Sperm recovered at various times in different regions of the Fallopian tube have varied so much in numbers that the data do not permit the construction of a model for the pattern of tubal sperm transport Williams et al. Medium Chance of Pregnancy We had sex but I was on my period. Leakage of the ejaculate from the vagina is highly unlikely to prevent you from getting pregnant. Although pre-ejaculate does not contain sperm when it is produced, it can pick up leftover sperm in the urethra. Vaginal defenses against infectious organisms may affect sperm. This arrangement of folds seems designed to entrap sperm and prevent further ascent. In the uterus, muscular contractions may enhance passage of sperm through the uterine cavity.
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Since then, evidence has been found for the formation of sperm storage reservoirs in a variety of species [mice Suarez, , rabbits Harper, ; Overstreet et al. The egg tries to pave the way for the sperms by releasing molecules and sending signals. The gel is degraded by prostate-specific antigen PSA , a serine protease secreted by the prostate gland Watt et al. In vitro , sperm fertility and motility are maintained longer when sperm are incubated with endosalpingeal epithelium [human Kervancioglu et al. Altogether, the evidence indicates that leukocytic invasion serves to protect against microbes that accompany sperm and does not normally present a barrier to normal motile sperm, at least not shortly after coitus. Are sperm stored in the cervix?