Occurrence of lymphohaemopoietic tissue in the meninges of the stingray Dasyatis akajei (Elasmobranchii, chondricthyes)

The American Journal of Anatomy
A ChibaA G Zapata

Abstract

The cytoarchitecture of the lymphohaemopoietic masses occurring in the "meninx primitiva" of the stingray Dasyatis akajei (Elasmobranchii, Chondricthyes) has been analyzed by light and scanning and transmission electron microscopy. Lymphohaemopoietic aggregates showing similar morphologies occurred along all the central nervous system, but they were more frequent in the telencephalon, diencephalon, and mesencephalon. In each aggregate, the granulopoietic tissue appeared in a fibroblastic stroma surrounding the large blood vessels, and the lymphoid components were present in a reticular network. Developing and mature eosinophils and heterophils--as well as lymphocytes, monocytes, macrophages, and plasma cells--are the main free cells present in these meningeal aggregates. The remarkable intimate association between macrophages and lymphoid cells to form close cell clusters suggests some immunological capacity for the meningeal lymphohaemopoietic tissue. According to their capacities, presence of lymphoid tissue, and histological organization, the meningeal lymphohemopoietic aggregates of Dasyatis akajei resemble other lymphomyeloid aggregates associated with cranium and choroid plexuses in Holocephali and Ganoidei. The phylogene...Continue Reading

References

Jan 1, 1977·The American Journal of Anatomy·R E Merchant, F N Low
Jun 1, 1976·The Journal of Comparative Neurology·J J Malloy, F N Low
Jan 1, 1983·Cell and Tissue Research·R Fänge, A Pulsford
Jan 1, 1981·Developmental and Comparative Immunology·A Zapata
Jan 1, 1980·Developmental and Comparative Immunology·A Zapata
Dec 1, 1986·The Biological Bulletin·Artur Mattisson, Ragnar Fänge

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Citations

Sep 9, 2005·Developmental and Comparative Immunology·H Dooley, M F Flajnik
Mar 27, 2020·Journal of Zoo and Wildlife Medicine : Official Publication of the American Association of Zoo Veterinarians·Alexa J Delaune, Chelsea E Anderson

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