Frequency and polymorphism of Hassall’s corpuscles in normal thymus of nutria (Myocastor coypus)
Journal Title: Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society - Year 2009, Vol 2, Issue 2
Abstract
Thymus from three clinically healthy 12-month-old age nutria were collected and histologically processed. Microscopic examination showed that the thymus contains numerous Hassall’s corpuscles in various stages of development, from very small (10-15 μm), composed of 1-2 degenerate reticuloepithelial cells, to very large corpuscles (sometimes exceeding 500 μm). In nutria, the genesis of Hassall’s corpuscles is more rapid than in most mammals. The corpuscles showed extended polymorphism, from round corpuscles to very particular forms, even odd, in some cases. The degenerated reticulo-epithelial cells represent the starting point in Hassall’s corpuscles formation. They ensure the growth of Hassall’s corpuscles and their adhesion to the reticulo-epithelial network, as well as the binding of two or more adjacent corpuscles. In a more advanced stage, increase in size of the joint corpuscles reduce the separating spaces up to absence, resulting corpuscles that appear like entities of 5-10 joint corpuscles, in different stages of organization. The fast genesis of Hassall’s corpuscles and inter corpuscular binding by means of degenerate reticulo-epithelial cells causes the particular polymorphism of these corpuscles with nutria.
Authors and Affiliations
Viorel Miclăuş, I. Petrescu-Mag, Vasile Rus, Daniel Cadar, Liviu Oana, Ciprian Ober
Keywords
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