Artículos de revistas
Cytological Steps During Spermiogenesis In The House Sparrow (passer Domesticus, Linnaeus)
Registro en:
Tissue And Cell. , v. 34, n. 4, p. 273 - 282, 2002.
408166
10.1016/S0040-8166(02)00017-4
2-s2.0-0036698905
Autor
Goes R.M.
Dolder H.
Institución
Resumen
Spermiogenesis of the domestic sparrow was investigated with the light and electron microscopes and a step by step classification is proposed. Three cell populations corresponding to early, mid and late spermatids were easily divided according to their positions in the seminiferous epithelium. In addition to this initial separation, six steps were recognized, based on nuclear morphology and the degree of chromatin condensation, in association to their acrosomal and flagellar development. Early spermiogenesis is the period previous to chromatin condensation. The first step can be recognized by the extending flagellum and the second by the pro-acrosome development in contact with the nucleus. During the third or intermediate step, chromatin condenses and the cell becomes polarized with the proacrosomic vesicle and the tail occupying opposite sides of the nucleus. Late spermiogenesis, including steps IV-VI, is marked by complete chromatin condensation. 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