Summary
The fine structure of chromaffin paraganglionic tissue situated in the endoneural space of the plexus surparenalis is described.
The paraganglionic tissue is found near capillaries with partially fenestrated endothelial cells and rarely scattered connective tissue cells. Two cell types are observed:
Type I-cells (chromaffin cells) with great, fine structured nucleus show in their cytoplasm electron dense granules (1,000–1,600 Å in diameter) with clinching membranes and vesicles of 2,000 to 4,000 Å in diameter. In the latter the normally excentric situated dense core is separated from the membrane by a wide cleft. Further large Golgi areas and near them uncharacteristic (developing) kinds of the granules, as described above, mitochondria, ergastoplasm and ribosomes occur. Microtubules and filaments are regularely, multivesiculated bodies occasionally found.
Type II-cells (surrounding cells) produce a basement membrane and envelope the chromaffin cells with fine processes. The cell organells are near the nucleus. The processes show a compact, partially fibrillar structure. On the cell surface condensations of the cytoplasm are observed in some regions. The surrounding cells do not contain vesicles with an electron dense core.
Myelinated nerves, wrapped by Schwann cells and surrounding cells approach to type I-cells and build synaptic junctions to their surface. In such cases constantly the chromaffin cells are seen as the postsynaptic part of the formation.
The type I-cells are thought to be of endocrine function, having an inhibitory effect on impulse transmission by secreting catecholamines. The type II-cells correspond to the cells of Schwann.
Zusammenfassung
Die Feinstruktur der chromaffinen paraganglionären Zellinseln im Endoneuralraum des Plexus suprarenalis wird beschrieben.
Das paraganglionäre Gewebe liegt neben Kapillaren mit teilweise fenestrierten Endothelien und spärlich verstreuten Bindegewebszellen. Es wird von zwei Zellarten aufgebaut:
Typ I-Zellen (chromaffine Zellen) mit großen, locker strukturierten Kernen enthalten im Zytoplasma elektronendichte Granula (1000–1600 Å Durchmesser) mit eng anliegender Membranbegrenzung und Vesikel von 2000–4000 Å Durchmesser, deren dichter Inhalt meist exzentrisch gelegen und durch einen weiten Spalt von der Membran getrennt ist. Weiters beobachtet man ausgedehnte Golgiregionen und in ihrer Nähe uncharakteristische (Entwicklungs-) Formen der beschriebenen Granula, Mitochondrien, Ergastoplasma und freie Ribosomen. Mikrotubuli und Plasmafilamente sind regelmäßig, multivesiculated bodies gelegentlich zu finden.
Typ II-Zellen (Hüllzellen) bilden eine Basalmembran aus und umgeben die chromaffinen Zellen mit dünnen Fortsätzen. Die Zellorganellen sind in der Nähe des Kernes gelegen, die Fortsätze weisen eine dichte, z. T. geordnete, fibrilläre Strukturierung auf. An der Zelloberfläche beobachtet man regionäre Zytoplasmaverdichtungen. Die Hüllzellen enthalten keine Bläschen mit elektronendichtem Inhalt.
Markfreie Nerven, in Schwannsche Zellen und Hüllzellen gelagert, ziehen an die Typ I-Zellen heran und bilden an deren Oberfläche synaptische Verbindungen aus. Dabei erscheinen die chromaffinen Zellen stets als postsynaptischer Teil der Formation.
Die Typ I-Zellen werden als endokrin tätige Zellen aufgefaßt, die durch Abgabe von Katecholaminen hemmend auf die Impulstransmission wirken. Die Typ II-Zellen entsprechen den Schwannschen Zellen.
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Böck, P. Die Feinstruktur des paraganglionären Gewebes im Plexus suprarenalis des Meerschweinchens. Z. Zellforsch. 105, 389–404 (1970). https://doi.org/10.1007/BF00335463
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DOI: https://doi.org/10.1007/BF00335463