Toyama Y, Calderón F U, Quesada R
Department of Anatomy, School of Medicine, Chiba University, Japan.
Cell Tissue Res. 1990 Mar;259(3):599-602. doi: 10.1007/BF01740789.
Crystalloids were found in Sertoli cells of the testis of the three-toed sloth by examination at the light- and 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 approximately 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 approximately 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 approximately 15 nm. Scattered polyribosomes were found between and around the bundles.
通过光学显微镜和电子显微镜检查发现，三趾树懒睾丸的支持细胞中存在晶体。针状或纺锤形晶体长短不一，位于支持细胞的基部。它们由直径约11纳米的细丝束组成。几根细丝呈六边形排列形成一束。一束细丝中各细丝之间的中心距约为17纳米。细丝上有周期性的侧向突起。晶体的横截面显示，这些突起从每根细丝向三个方向辐射，形成一个边长约15纳米的等边三角形。在细丝束之间和周围发现了分散的多核糖体。
