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A cell of the last or next to the last generation of male germ cells which differentiates to form spermatozoa.



a male sexual cell derived from a spermatogonium. Two types of spermatocytés are distinguished: primary and secondary. Primary spermatocytes develop during the growth period, and secondary spermatocytés during the second meiotic division. The latter subsequently give rise to spermatids.

References in periodicals archive ?
Control group Table 3: The number of different testis cell types (x[10.sup.6]) Groups Spermatogonia A Spermatogonia B Sertoli cell Control 0.83[+ or -]0.06 0.16[+ or -]0.07 2.7[+ or -]0.2 BD1/2 0.83[+ or -]0.05 0.13[+ or -]0.05 2.5[+ or -]0.1 BD1/4 0.84[+ or -]0.05 0.18[+ or -]0.05 2.7[+ or -]0.3 Groups Primary Round Long spermatocyte spermatid spermatid Control 12.1[+ or -]0.98 31.8[+ or -]2.49 30.9[+ or -]3.02 BD1/2 12.0[+ or -]0.80 31.0[+ or -]2.18 30.6[+ or -]2.66 BD1/4 12.4[+ or -]0.92 32.2[+ or -]2.20 32.1[+ or -]2.65 Groups Leydig cell Control 2.2[+ or -]0.02 BD1/2 2.5[+ or -]0.15 (**) BD1/4 2.1[+ or -]0.03 The values (n=5) are presented as mean[+ or -]SD.
The condition of the gametes in a ripe triploid male is largely immature, with mostly primary spermatocytes, variable but minority proportions of secondary spermatocytes/spermatids, and rare populations of spermatozoa.
Prolonged dosing resulted in continued spermatocyte degeneration as well as maturation depletion of the spermatid population, leaving tubules containing only sustentacular cells, spermatogonia and preleptotene spermatocytes.
Presence of spermatocytes was observed in males, as well as spermatozoids in the spermatic lobes and spermatic sacs (Fig.
This significant decline can be explained with either of the following reasons: L-cys as a nucleophile (10) might prevent AA, which is an electrophile, from damaging primary spermatocytes with a specific elimination reaction (25,26), or L-cys, as a precursor of glutathione, might increase the antioxidant capacity of the body.
Score 5 of Johnsen categories is characterized by primary spermatocytes that will enter meiosis.
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.
Concerning dogs, LepR is absent from Leydig cells and Sertoli cells but present in spermatocytes and spermatids [22].
A) Primary spermatocytes (40X); B) Secondary spermatocytes (40X); C) Spermatids (40X); D) Spermatozoa (40X); E) Spermatozeugmata (20X).
By analyzing of the distribution of the pattern of constitutive heterochromatin in spermatocytes in prophase I has been possible to differentiate all species of Maculata subcomplex: T.
Spermatogonia decreased and numerous primary and secondary spermatocytes were visible.