Morphological correlates of permeability in the frog perineurium: vesicles and "transcellular channels"

Cell and Tissue Research
N L ShinowaraS I Rapoport

Abstract

Lanthanum, applied to the outside of the fixed sciatic nerve of Rana pipiens, did not enter the endoneurium, but was halted by functionally tight junctions at the inner layers of the perineurium. This component of the blood-nerve barrier consists of several concentric layers of cells interspersed with an extracellular matrix of amorphous ground substance, collagen fibrils, and fine filaments. Numerous vesicular profiles are closely associated with the surface membranes of all the cells. The application of lanthanum to fixed tissue revealed that these profiles are attached to the cell surface by narrow necks, and open to the extracellular space. The attenuated cells are filled by the vesicular structures, which often appear to overlap. Stereoscopic electron microscopy showed that these vesicles did not fuse with each other or with the apposing cell surface to form transcellular channels. Channel formation does not appear to contribute significantly to the permeability of any of the perineurial layers.

Citations

Jan 1, 1984·Anatomy and Embryology·S Sakada, T Sasaki
Aug 1, 1988·Journal of Neurocytology·E Matsumoto, J Rosenbluth
May 7, 1984·Brain Research·M E MichelS I Rapoport
Oct 1, 1990·Journal of the Neurological Sciences·T J BensteadP J Dyck
Jan 1, 1987·Progress in Neurobiology·E Rechthand, S I Rapoport
Jun 1, 1994·Progress in Neurobiology·K C Wadhwani, S I Rapoport
Oct 1, 1991·APMIS : Acta Pathologica, Microbiologica, Et Immunologica Scandinavica·N G BeamishA Oldfors
Jun 5, 1989·Brain Research·T J BensteadV Sangalang
Jun 4, 1986·Brain Research·A Weerasuriya, S I Rapoport
Sep 1, 1984·Microvascular Research·M E MichelS I Rapoport
Jan 1, 1988·The American Journal of Physiology·K C WadhwaniS I Rapoport

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