Me. Ortiz et al., SPERM MIGRATION THROUGH THE FEMALE GENITAL-TRACT OF THE NEW-WORLD MONKEY CEBUS-APELLA, Biology of reproduction, 52(5), 1995, pp. 1121-1128
This study was designed to characterize sperm migration in the female
genital tract of Cebus apella. Forty-eight cycles of eighteen females
mated during the periovulatory period were studied. Eggs were searched
for and spermatozoa were counted in segmental flushings of the genita
l tract performed in situ 1-7 h, 19-31 h, or 45-56 h after coitus. Of
14 eggs recovered, 8 were fertilized, thus assuring a reasonable norma
lity of prefertilization phenomena in both males and females. A downwa
rd gradient of several orders of magnitude in sperm numbers was recogn
ized from cervix to ampulla, particularly over the first interval. The
population in the cervix and uterus decreased progressively between t
he first and last interval. Spermatozoa were recovered from the ampull
a as early as 1 h after mating. Different trends were observed in the
isthmus and ampulla. From the first to the last interval, sperm number
s decreased in the ampulla, but not in the isthmus. The number of sper
matozoa recovered from the ampulla of the ovulatory side 1-31 h postco
itum was higher in postovulatory than in preovulatory monkeys, while i
n the nonovulatory side, recovery was similar in the two conditions. T
his finding suggests that the passage of spermatozoa up to the site of
fertilization is under local control and is synchronized with ovulati
on. The pattern of sperm migration that emerges from these data bears
similarities to the pattern in nonprimate species as well as distincti
ve features. A unique feature in common with the pattern in humans is
the early establishment of a fairly abundant and persistent sperm popu
lation in the ampulla.