The supramedullary neurons (SN) are a noradrenergic autonomic system of giant cells, dorsally grouped in a cluster at the boundary between medulla oblongata and spinal cord in some orders of fish, and aligned one by one along the spinal cord in others. Morphology, number and size are peculiar for each species. The axons of SN terminate in the epidermal layer near the mucous glands. Because of the role of aspecific defence of skin mucous cells in fish, the SN system may act in protection from predaction or prevent infection. In this view the study of SNS is very interesting in species fishing of considerable market price.The SN of Solea ocellata, about 70, are distributed in small groups of 2-4 along the cord. The unique nucleolus is intensely basophilic. Vacuoles and endocellular capillaries are present in the cytoplasm, as in SN clustered. The cytometry showed a large variability and a wide range of cells and nuclei size. On the contrary, the nucleoli showed an almost uniform size. The nuclei showed an intense Feulgen-positivity. The cytofluorimetric evaluation revealed a DNA content ranging from 6C in the smaller neurons to 100C in the larger ones, indicating that the peculiar phenomenon of DNA amplification is present also in the SN of S. ocellata, as so far known in those clustered only. Thus, the SN of S. ocellata have characteristics between those clustered and those aligned. The case of S. ocellata suggests that the parting of SN in “aligned” and “clustered” should not be interpreted in absolute way, because this neuronal system shows in different species a wide morphological variability, which reflects functional differences, probably related to environment and behaviour.
|Data di pubblicazione:||2006|
|Titolo:||CYTOMETRY OF SUPRAMEDULLARY NEURONS IN SOLEA OCELLATA|
|Autori:||B. Cuoghi; M. Vallisneri; L. Mola|
|Nome del convegno:||XII National Conference of the Italian Society opf Cytometry|
|Luogo del convegno:||San Benedetto del Tronto (AP)|
|Data del convegno:||ottobre 2005|
|Appare nelle tipologie:||Abstract in Rivista|
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