Relations entre l'anneau postnucléaire, la chromatine et l'enveloppe nucléaire des spermatides de Bélier. Conception d'un modèle partiel pour expliquer les déplacements de la manchette

After alkaline extraction, the postnuclear band appeared to be composed of two parts, the intranuclear part contiguous to the chromatin and the extranuclear part apposed to the external membrane of the nuclear envelope. This membrane was discontinuous inside the postnuclear band, revealing that the band might be a zone of nuclear envelope remodeling. A model is proposed to explain the pulling of the manchette by intranuclear forces and the formation of the redundant nuclear envelope during spermiogenesis.