Males of Myleus ternetzi, at various maturation stages were netted in a French Guyana river. Testes were histologically and ultrastructurally analysed. Leydig cells were always present in large numbers. In mature or almost mature testes, they were characterized by a large spherical nucleus and an extensively developed smooth endoplasmic reticulum (SER) composed of very narrow tightly packed tubules. In regressed testes, most of the Leydig cells had a smaller nucleus with an irregular shape, a disorganized SER and the fine structure of the mitochondria was greatly affected. These changes would reflect different phases throughout a metabolic cycle in relation to spermatogenesis.
Auteurs du document :
Maurice Loir, Anne Margeridon, Chantal Cauty
Obtenir le document :
EDP Sciences
Mots clés :
Fish, South America, testis, Leydig cell, ultrastructure, Poisson, Amérique du Sud, testicule, cellule de Leydig, ultrastructure
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