The experiment described the morphological and morphometrical characteristics as well as
estimate the population of primordial, primary and secondary ovarian follicles from common
squirrel monkey (Saimiri sciureus). Ovaries (n = 10) from five senile squirrel monkeys
were collected after natural death and processed for classical histology. The mean ovarian
population was estimated as 915.04
?
78.83, 230.46
?
20.82 and 115.88
?
15.72 primordial,
primary and secondary follicles per ovary, respectively. 73.30% were classified as primordial,
18.62% as primary, and 8.09% as secondary follicles. From all these developmental
stages, the mean diameters of follicles, oocytes, oocytes nuclei and the mean number of
granulosa cells were described. The number of granulosa cells surrounding normal primordial
follicles (5.65
?
0.001) was lower (P < 0.05) than the number of granulosa cells
(13.17
?
0.02) surrounding the primary follicles. Secondary follicles presented the highest
(P < 0.001) number of granulosa cells surrounding each oocyte (273.73
? 20.80). We have
estimated the follicular population, as well as described the morphometric and morphological
characteristics of preantral follicles from senile squirrel monkeys, which may be a
valuable animal model for female ovarian aging studies.
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