In contrast to postpubertal spermatogenesis, the early steps of germ cell development have only recently attracted attention, unveiling genes and pathways regulating SSC self-renewal and proliferation. Yet, less is known on the mechanisms regulating differentiation. The processes leading from gonocytes to spermatogonia have been seldom This is to produce a large count of spermatogonia. Type A and type B are its two kinds. Type A spermatogonia act as the stem cells that split to make additional spermatogonia. On the other side, Type В spermatogonia can be assumed as the prototypes of male sex cells. DIFFERENCES BETWEEN SPERMATOGENESIS AND OOGENESIS. Nature of the process: A careful examination of several spermatogonia revealed minor structural differences and differential toluidine blue uptake among them . Based on these structural and staining differences, type A spermatogonia were classified into three subtypes. In subtype I, the cells were smaller in size, compared with the other two subtypes. Male Reproductive System: Spermatogenesis The production of sperm and eggs/ova (gametes) is a procedure called gametogenesis (spermatogenesis and oogenesis). Gametogenesis involves two rounds of meiotic cell division, in which one diploid cell gives rise to 4 haploid cells. Fig. 7.2. Overview of the overlapping events that occur during late meiotic prophase of sperm cell formation. ( a) Schematic of the progression of male germline cells ( blue) during spermatogenesis. Cells are attached to the rachis through karyosome formation, then bud off of the rachis to undergo meiotic divisions. JC5q.

difference between spermatogenesis and spermatogonia