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Related to Spermatogonium: oogonium, spermatogonia


A primitive male germ cell, the last generation of which gives rise to spermatocytes.



a developing male sexual cell during the period of division prior to growth. Spermatogonia are in a state of rapid mitotic division. Primary and secondary spermatogonia are distinguished in insects and certain other invertebrates; secondary spermatogonia, the smaller of the two types, are surrounded by cells that form the seminal vesicle, or spermatocyst. Mammals have two types of spermatogonia, which differ in degree of differentiation and in chromatinic structure. The duration of the period of division varies from one animal species to another, depending on the number of generations and the rate of division of spermatogonia—parameters that are constant for eachspecies. Spermatogonia are formed in the parietal layer of the seminiferous tubules. Many animals have a specific zone of division in the cecum of the testes.

References in periodicals archive ?
Electron microscopic observations indicated that the hepatopancreatic cells, spermatogonium, gill tissues and muscle cells of the crabs with HPND showed severe structural and morphological changes, but microorganisms including bacteria, fungi, microsporidian and viruses were not detected; the healthy crabs were fed/injected with diseased tissues, the symptoms of HPND were not found, suggesting that the diseased crabs with HPND sampled from the farms were not infected by pathogenic organisms.
VDR is found in the smooth muscle of epididymis, spermatogonium, Sertoli cells and head of the sperm indicating an important role in the production and transport of sperm (Kinuta et al.
Spermatogonium, primary spermatocyte, and spermatid cells that demonstrated TUNEL positive staining in preparations, showed the presence of apoptotic cells (Figure 2b).
Experimentally induced diabetic rats show disturbed spermatogenesis, dilated seminiferous tubules, and decreased numbers of spermatogonium, primary spermatocytes, spermatids, and mature spermatozoa [54].
At sexual maturity, the spermatogonium divides and either develops into a type A spermatogonia, remaining an undifferentiated stem cell, or differentiates through mitotic cycles into a type B spermatogonia.