Summary
Nerves and ganglia from a variety of fish, amphibian, reptilian and mammalian species were studied by optical and electron microscopy. Observations using the Picrosirius-polarization method strongly suggest that two different types of collagen fibers are present in the connective tissues of nerves and ganglia. Electron microscopy of nerves and ganglia showed the presence of two different collagen fibril populations, distinguishable on the basis of diameter, located in different compartments of these structures. Thicker fibrils are present in nerve and ganglionic epineurium. Thinner fibrils are present in the endoneurium, surrounding nerve fibers and ganglionic cells, and between the concentric layers of perineurial cells. These results were consistently observed in all species studied and very probably represent a general phenomenon in vertebrates.
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This work was aided by a grant from the Fundação de Amparo à Pesquisa do Estado de São Paulo
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Junqueira, L.C.U., Montes, G.S. & Krisztán, R.M. The collagen of the vertebrate peripheral nervous system. Cell Tissue Res. 202, 453–460 (1979). https://doi.org/10.1007/BF00220437
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DOI: https://doi.org/10.1007/BF00220437