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Ultrastructural observations show that in Saduria entomon (L., 1758) sperm bundles are organized already in the testis, and that a crucial function in this process is played by Sertoli cells, whose protrusions are connected with maturing spermatids. The specific arrangement of maturing spermatids around a Sertoli cell protrusion and their turned-out tails lying centrally in channels reflect the arrangement of spermatozoa in a later bundle. One might assume, therefore, that the pattern along which sperm bundles are organized, which results from their specific structure, is made possible by the way in which the lumen of the testis is penetrated by protrusions of the Sertoli cells. A further role of the Sertoli cells is to produce and secrete matrix components and precursor material for extracellular tubules. Both structures are permanent elements of sperm bundles in isopods. In S. entomon extracellular tubules have a diameter of 80 nm, and their assembling proceeds in close contact with the membrane of a Sertoli cell protrusion.

Des observations ultrastructurales montrent que, chez Saduria entomon (L., 1758), les masses spermatiques sont deja organisees dans le testicule et qu'un role crucial dans le processus est joue par les cellules de Sertoli, dont les protrusions sont connectees avec les spermatides en maturation. L'arrangement specifique de ces dernieres autour d'une protrusion de cellule de Sertoli et de leurs queues retournees en position centrale dans les canaux reflete l'arrangement des spermatozoodes dans une masse ulterieure. On peut de ce fait presumer que le modele suivant lequel les masses spermatiques sont organisees, et qui resulte de leur structure specifique, est rendu possible par la facon par laquelle les protrusions des cellules de Sertoli penetrent le testicule. Un autre role des cellules de Sertoli est de produire et de secreter les composants de la matrice et le materiel precurseur pour les tubules extracellulaires. Les deux structures sont des elements permanents des masses spermatiques chez les isopodes. Chez S. entomon, les tubules extracellulaires ont un diametre de 80 nm, et leur assemblage s'effectue en etroit contact avec la membrane d'une protrusion de cellule de Sertoli.


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