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Die Feinstruktur des Subfornikalorgans beim Kaninchen - I. Die Blutgefässe

Zeitschrift für Zellforschung und Mikroskopische Anatomie, ISSN: 0302-766X, Vol: 74, Issue: 2, Page: 252-270
1966
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    22
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      22

Article Description

The blood vessels in the subfornical organ (SFO) of 11 young-adult rabbits have been investigated with the electron microscope. (Prefixation with glutaraldehyde, fixation with osmium tetroxide, embedding in epon.) Within the well vascularized SFO few arterioles and venules are found; however, as to the structure of the wall a narrow relationship exists between many of the terminal vessels and the larger vessels: There are capillaries (resembling the arterioles) with a narrowed lumen, the width of the endothelium is irregular. These capillaries are accompanied by several pericytes, the cytoplasm of which can hardly be distinguished from the cytoplasm of smooth muscle cells. Furthermore there are numerous capillaries of usual structure. "Sinusoid-like" vessels (resembling the venules) are found with a wide lumen; the width of the endothelium is uniformly small. Few pericytes are seen, the cytoplasm of which resembles that of the endothelial cells. The blood vessels in the SFO of the rabbit are characterized by large labyrinths formed by the basement membrane; they extend deeply into the surrounding tissue. The compartments of the labyrinths are in contact with the adjacent tissue and contain structures of the neuropil. The "sinusoid-like" vessels do not possess labyrinths as frequently as the other vessels of the SFO. - Typical perivascular spaces are absent. At some places, however, the basement membrane is split and encloses small extracellular caves showing lower density. - The peculiar structures of the basement membrane in the SFO of the rabbit are compared with the typical perivascular spaces in the most circumventricular organs and even in the SFO of other species. These structures are discussed with regard to the blood-brain barrier. © 1966 Springer-Verlag.

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