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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 110 (1970), S. 471-486 
    ISSN: 1432-0878
    Keywords: Epiplexus (Kolmer) cells ; Choroid plexus ; Cat ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A light and electron microscopic study was made of the epiplexus (Kolmer) cells of the cat choroid plexus. These polymorphic, motile cells were typically found juxtaposed to the ventricular surface of the choroidal epithelium. They have many ultrastructural features in common with free macrophages of other systems, namely, an indented nucleus with condensed chromatin, sparse mitochondria and endoplasmic reticulum, free ribosomes, multiple Golgi elements, microtubules, coated surface invaginations and microvesicles, and numerous membrane-limited vacuoles and lysosomal dense bodies. A unique feature of epiplexus cells is the manner in which they are anchored to the choroidal epithelium by the invagination of their surfaces by epithelial cell microvilli and cilia. Electron dense tracer particles (biological India ink, Thorotrast, ferritin) injected into the cerebral ventricles were ingested rapidly by epiplexus cells. Uptake of the particles was by way of coated surface invaginations which produced coated cytoplasmic microvesicles. Particle-containing microvesicles subsequently fused with each other and presumably also with pre-existent cytoplasmic vacuoles and lysosomal dense bodies to form storage vacuoles (phagosomes phagolysosomes and residual bodies). Present evidence suggests that epiplexus cells are of hematogenous origin. Under certain conditions these cells may detach from the surface of the choroid plexus to become free-floating cells in the various cerebrospinal fluid compartments of the brain.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: A volume-distribution analysis of the water soluble contrast medium, meglumine iothalamate, injected into various ventricular and subarachnoid sites was accomplished radiographically in the cat with the aid of a newly designed screw-type cannula having a deadspace of 6 to 8 m̈l. The cannula is positioned stereotaxically and mounts directly and permanently in the cranium by a single self-tapping insertion maneuver. As little as 100 m̈l of solution injected into the anterior horn of the lateral ventricle, or 50 and 20 m̈l into the third and fourth ventricles, respectively, was visualized immediately in the lateral apertures of the fourth ventricle connecting with the subarachnoid spaces. Injection of 50 m̈l into the posterior horn of the lateral ventricle delineated the entire ventricle as well as the interventricular foramen. A volume of 12 m̈l deposited in the base of the third ventricle served to define the hypothalamic cleft and infundibular recess. If rate of injection was not excessive, the solution could be introduced into the third and fourth ventricles without penetrating into the more anterior regions. Radiopaque medium injected into subarachnoid spaces (cisternae ambiens and cerebellomedullaris) did not enter the ventricular system.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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