Ultrastructural study of crystalloids in Sertoli cells of the three-toed sloth (Bradypus tridactylus) |
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| Authors: | Yoshiro Toyama Francisco Ureña Calderón Rafael Quesada |
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| Institution: | (1) Department of Anatomy, School of Medicine, Chiba University, 280 Chiba, Japan;(2) Department of Physiology, School of Medicine, University of Costa Rica, San José, Costa Rica;(3) Department of Anatomy, School of Veterinary Medicine, National University of Costa Rica, Heredia, Costa Rica |
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| Abstract: | Summary Crystalloids were found in Sertoli cells of the testis of the three-toed sloth by examination at the lightand electron-microscopic levels. Needle-, or spindle-shaped crystalloids, varying in length, were located in the basal part of the Sertoli cells. They consisted of bundles of filaments each measuring ~ 11 nm in diameter. Several filaments were packed hexagonally to form a bundle. The center-to-center distance between individual filaments of a bundle was ~ 17 nm. Periodical lateral projections emanated from the filaments. Cross sections of crystalloids showed that the projections radiated from each filament in three directions, forming an equilateral triangle with a side length of ~ 15 nm. Scattered polyribosomes were found between and around the bundles. |
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| Keywords: | Crystalloids Filaments Sertoli cells Testis Ultrastructure Three-toed sloth Bradypus tridactylus (Edentata) |
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