Summary
The primary spermatocytes which are the products of division of the spermatogonia embark on the prophase of the first division after a brief period of rest. The leptotene filaments are formed soon after and the polar orientation of the filaments results in a leptotene bouquet. Parallel conjugation of the leptotene filaments gives rise to the thicker pachytene threads, the conjugation beginning at the proximal pole. When the fusion between the apposing filaments is more or less intimate, the polarisation is lost and immediately after, splits appear along the threads at intervals, giving rise to the diplotene stage. The diplotene is followed by a pronounced and conspicuous diffuse stage where all individuality of the chromosomes is temporarily lost, the nucleus itself becoming a faintly staining reticulum, in its greatest development. Soon, the chromosomes emerge from the diffuse mass and the bivalents which now appear more or less clear, twist about each other giving rise to the strepsinema. A condensation and contraction of the chromosomes give rise to the diakinesis where 21 deeply staining tetrads of different forms are seen arranged peripherally inside the nuclear membrane. The spindle is formed between the centrioles, the nuclear membrane is lost and the tetrads take their place on the spindle. 21 tetrads can be clearly seen in the metaphase plates of the division, the four components of each tetrad being seen clearly for the first time in anaphase. A conspicuous interkinesis separates the first and second divisions, when the nucleus resumes the appearance of a faintly staining network. The second division follows quickly separating each dyad into two monads. 21 dyads are seen in the metaphase plates of this division while 21 monads can be counted in the anaphase plates. The resulting cells are the spermatids.
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Seshachar, B.R. The spermatogenesis of ichthyophis glutinosus (Linn.). Z.Zellforsch 27, 133–158 (1937). https://doi.org/10.1007/BF01880080
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DOI: https://doi.org/10.1007/BF01880080