Summary
The lateral ventricles of the Pekin duck, Anas platyrhynchos, display characteristic ependymal and hypendymal specializations. Adjacent to the nucleus accumbens and the basal pole of the lateral septum the ventricular surface shows a highly folded pattern either with protrusions into the ventricular lumen or deep invaginations into the brain tissue. These medial and basal ependymal folds are found exclusively in a circumscribed region extending over a range of 600 μm in the rostrocaudal direction. Ependymal folds occurring in the lateral wall of the ventricles were traced up to the level of the interventricular foramen. Numerous capillaries are observed in the subependymal layer of these folds.
By means of immunocytochemistry with antibodies against chicken vasoactive intestinal polypeptide (VIP) an aggregation of classical cerebrospinal fluid-contacting neurons is shown in the region of the nucleus accumbens and the lateral septum. These neurons are closely related to the ependymal folds. Additional VIP-immunoreactive neurons are scattered in deeper layers of the lateral septum and the nucleus accumbens. The latter are richly innervated by VIP-immunoreactive nerve fibers.
The results of the present study are discussed with particular reference to the hypothesis of Kuenzel and van Tienhoven (1982) that ependymal specializations demonstrated in the lateral ventricles of the domestic fowl might represent a new circumventricular organ (“lateral septal organ”).
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The authors are greatly indebted to Professor A. Oksche for stimulating discussions
Supported by the Deutsche Forschungsgemeinschaft (Ko 758/2-2; 2-3) and the P. Carl Petersen Foundation
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Korf, H.W., Fahrenkrug, J. Ependymal and neuronal specializations in the lateral ventricle of the Pekin duck, Anas platyrhynchos . Cell Tissue Res. 236, 217–227 (1984). https://doi.org/10.1007/BF00216534
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DOI: https://doi.org/10.1007/BF00216534