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Reproduction, development and work
Published in Chris Winder, Neill Stacey, Occupational Toxicology, 2004
Under this new type of cell division, the stem cells stay at the periphery of the seminiferous tubule, and the spermatocyte cell begins moving towards the centre of the tubule. The spermatocyte undergoes meiosis to form secondary spermatocytes, and then spermatids. These are still basically cellular structures, and must undergo further structural changes to become sperm. This includes losing excess cytoplasm, packing the cell DNA into the head, and formation of a three-piece tail.
Life History
Published in Karol Opuszynski, Jerome V. Shireman, HERBIVOROUS FISHES: Culture and Use for Weed Management, 2019
Karol Opuszynski, Jerome V. Shireman
The process of sperm development is far less complex. Primitive sperm cells (spermatogonia) multiply by mitosis in the tubular wall in the testis. Primary spermatocytes develop from the spermatogonia. Each primary spermatocyte divides (meiotic division) into two secondary spermatocytes, and each secondary spermatocyte divides into two spermatozoa or sperm. The sperm remain in the testis in the resting stage until the fishes are ready to spawn.
Glossary of scientific and technical terms in bioengineering and biological engineering
Published in Megh R. Goyal, Scientific and Technical Terms in Bioengineering and Biological Engineering, 2018
Spermatocyte refers to the premeiotic parental cell of the spermatids; the primary spermatocyte before the initiation of the first meiotic division; the secondary spermatocyte after completion of the first meiotic division, but before the initiation of the second division. Synonym is sperm mother cell.
A male germ cell assay and supporting somatic cells: its application for the detection of phase specificity of genotoxins in vitro
Published in Journal of Toxicology and Environmental Health, Part B, 2020
Khaled Habas, Martin H. Brinkworth, Diana Anderson
Spermatogenesis is a complex process involving division and differentiation of spermatogonial stem cells into mature spermatozoa. The spermatogenesis process comprises several phases, namely the mitosis proliferation of spermatogonial stem cells to differentiate into spermatocytes, which then undergo meiotic divisions. The division of spermatocyte meiosis to produce haploid round spermatids undergoes spermiogenesis, a differentiation process that comprises the shedding of cytoplasm and compaction of the nucleus of spermatids production of a flagellum and undergoes elongation and condensation of the nucleus, creating elongating and condensing spermatids and untimely mature spermatozoa (Wistuba, Stukenborg, and Marc Luetjens 2007).
Ameliorative role of neem (Azadiracta indica) leaves ethanolic extract on testicular injury of neonatally diabetic rats induced by streptozotocin
Published in Egyptian Journal of Basic and Applied Sciences, 2020
Abd El-Fattah B. M. El-Beltagy, Amoura M. Abou El-Naga, El-Sayed M. El-Habibi, Sara El-Said M. Shams
In control and neem supplemented groups, the testicular sections showed the normal histological pattern whereas, the seminiferous tubules appeared rounded or oval and surrounded by a thin basal lamina (BL). The tubules were lined by stratified germinal epithelium, spermatogonia, primary spermatocytes, secondary spermatocytes, spermatids and spermatozoa. In-between the tubules, the interstitial tissue present blood vessels with clusters of Leydig cells with their characteristic oval shape and spherical nuclei (Figure 5(a,b)).