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 (spər-măt′ə-sīt′, spûr′mə-tə-)
A diploid cell that undergoes meiosis to form four spermatids. A primary spermatocyte divides into two secondary spermatocytes, which in turn divide to form the spermatids.


1. (Zoology) zoology an immature male germ cell, developed from a spermatogonium, that gives rise, by meiosis, to four spermatids
2. (Botany) botany a male germ cell that develops into an antherozoid
Also called: nematoblast or nematocide


(spɜrˈmæt əˌsaɪt)

a male sex cell that gives rise by meiosis to a pair of haploid cells, which become the reproductive cells.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.spermatocyte - a male gametocyte that develops into four spermatids
gametocyte - an immature animal or plant cell that develops into a gamete by meiosis
References in periodicals archive ?
For diploids, typical mitotic proliferation of spermatogonia was apparent and these cells were clearly differentiating into primary spermatocytes; however, unlike in diploids, most of the primary spermatocytes in triploids were not maturing further.
In the STs, predominant primary spermatocytes and spermatogonia were stained as PCNA-positive in the control and L-cys groups.
Photomicrographs of the cross-sections of seminiferous tubules represent the stages of spermatogenesis of seminiferous epithelium: spermatogonia type A (short arrows), primary spermatocytes at the pachytene stage (long arrows), spermatids at the zygotene stage (ellipse area) and spermatozoa (rectangular area).
Score 5 of Johnsen categories is characterized by primary spermatocytes that will enter meiosis.
Primary spermatocytes predominate in early recrudescence whereas in late recrudescence, secondary spermatocytes and spermatids were abundant; (3) Spermiogenesis, lumina of seminiferous tubules were lined by sperm or clusters of metamorphosing spermatids.
Type A spermatogonia at the basal lamina of seminiferous tubules, as well as primary spermatocytes in the leptotene and pachytene stages of prophase I, were also observed in the seminiferous epithelium.
Primary spermatocytes had an enlarged nucleus and were held tightly together in a cyst (Fig.
Quantification of Germ Cells at Stages VII and VIII in Seminiferous Epithelial Cycle: The H&E stained slides were examined under a light microscope (Zeiss/German) and different cells (sustentacular or sertoli, Spermatogonia [Sg], Primary Spermatocytes [Sc], Spermatid and Spermatozoid) present at this stage were counted with an objective lens x40.
In the proximal area, the epithelium is discontinuous and thin (18.96 [+ or -] 0.987 [micro]m), consisting of scarce primary spermatocytes and spermatogonia.
Primary spermatocytes, stained with the anti-SCP3 antibody, were selected to evaluate the respective percentages of leptotene, zygotene, pachytene and diplotene stages.