Ultrastructure of the nephridio-circulatory connections in Tubulanus annulatus (Nemertini, Anopla) View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1987-09

AUTHORS

Å. Jespersen, J. Lützen

ABSTRACT

The protonephridial terminal organs in the nemertean Tubulanus annulatus form an integral part of the blood vessel wall. Both endothelial and muscle-cell layers of the vessel's wall are discontinued at the site of each terminal organ. The terminal organs are usually composed of from one to three terminal cells enclosing a central lumen provided with many microvilli and separated from the blood vessel's lumen by a membranous filtration area. The latter is perforated by numerous winding clefts formed by interdigitation of minute cytoplasmic pedicels arising from processes issued by each of the involved terminal cells. Ultrafiltration of blood plasma takes place across a filtration membrane which spans the cleft system and the basal lamina of the terminal cells. Fluid is propelled into the lumen of the terminal organs through the activity of ciliary bundles, one for each terminal cell involved, perhaps supplemented by vascular turgor. All efferent conduits of the protonephridium have profuse infoldings of the luminal cell surfaces and/or numerous pinocytotic pits suggestive of reabsorption of substances from the primary urine. More... »

PAGES

181-189

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00312311

DOI

http://dx.doi.org/10.1007/bf00312311

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1023980713


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