Spermatogenesis is the development of the mature male germ cells called sperm cells or spermatozoa. Primordial germ cells, the founder cells of the germ line, develop through several immature stages by undergoing mitosis, meiosis and differentiation into the haploid spermatozoa, which carry only one ...
Dadzie S (1969) Spermatogenesis and the stages of maturation in the male cichlid fish Tilapia mossambica. J Zool 159:399-403DADZIE, S., 1969, Spermatogenesis and the stages of maturation in the male cichlid fish Tilapia mossambica. J. Zool., 159 : 399-403....
Spermatogenesis is a continuous process during adult life and, thus, the adult testes contain all stages from stem cells to mature sperm (Figure 1). As in mammals, the germ cells develop in close contact with somatic cells, in this case the cyst cells, which are of mesodermal origin. At...
Definition of the stages of the cycle of the seminiferous epithelium in the rat. Ann N Y Acad Sci. 1952;55(4):548–73. Article CAS PubMed Google Scholar Lee J, Kanatsu-Shinohara M, Inoue K, et al. Akt mediates self-renewal division of mouse spermatogonial stem cells. Development. ...
(Stages of spermatogenesis) 可分為以下 3 個階段 : 1) 倍增期 (multiplication phase) 有絲分裂 生殖上皮細胞 (2n) --- 精原細胞 (2n) 2) 生長期 (stage of growth) 生長 精原細胞 (2n) --- 初生精母細胞 (2n) *減數分裂 I 初生精母細胞 (2n) --- 次生精母細胞 3) 成熟期 (stage of ...
(Supplementary Fig.3e). Compared to WT mice, the germ cells in KO mice were sparsely arranged during different spermatogenesis stages, as indicated by H&E staining (Fig.4a). Using STA-PUT velocity sedimentation to separate spermatogenic cell types, we further defined the numbers of spermatocytes...
as a group. That is, all of the cells within a given cyst will be in the same approximate stage of meiosis. A good longitutinal section will have nearly all of the stages of meiosis displayed on one section, but you may have to examine several slides to observe all of the stages. ...
Morphological alterations of all stages of spermatogenesis and acrosome reaction in Chinese mitten crab Eriocheir sinensis. Cell Tissue Res. 360, 401-412.Morphological alterations of all stages of spermatogenesis and acrosome reaction in Chinese mitten crab Eriocheir sinensis. Wang, Y.L,W.J Sun,L....
In addition to their role in chromosomal pairing to regulate pre-pachytene stages of prophase I, epigenetic marks also play a role in meiotic recombination, or crossovers, during pachytene. Concentrated “hotspots,” where DNA double-strand breaks occur that resolve in crossover events, are concur...
Besides germline cells at their various differentiation stages, different somatic cell types coexist within the mammalian testes: Sertoli cells, which support and nour- ish the germline cells inside the seminiferous tubules; peritubular myoid cells; and different types of intersti- tial cells, ...