Summary
The hypothalamus of adult lampreys (Lampetra fluviatilis L.) was studied by means of light and fluorescence microscopy (Falck's technique). Some single liquorcontacting nerve cells (LCNC) showing a weak green fluorescence were demonstrated in the ventral part of the third ventricle, above the preoptic recess. Caudally numerous fluorescent LCNC occur in the ventral part of the third ventricle, in the infundibular and in the posterior recess. The LCNC are to be observed between or below the ependymal cells lining the ventricular wall. These cells appear to be of the bipolar type. One process with a club-like protrusion is directed into the ventricular lumen, the other one into the opposite direction. Two types of fluorescent LCNC were distinguished: yellowish green cells, containing catecholamines, and yellowish orange cells, containing 5-hydroxytryptamine. Some similarity between the hypothalamic monoaminergic LCNC in lampreys and LCNC of the paraventricular organ of the other vertebrates was found. The localization, structure and monoaminergic nature of the hypothalamic LCNC in lampreys suggest the possibility, that their monoamines are released into the cerebrospinal fluid.
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I am very obliged to Prof. A.L. Polenov for his continuous help and advice. The skilful technical assistance of Mrs. G.N. Yakshina is gratefully acknowledged.
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Konstantinova, M. Monoamines in the liquor-contacting nerve cells in the hypothalamus of the lamprey, Lampetra fluviatilis L.. Z.Zellforsch 144, 549–557 (1973). https://doi.org/10.1007/BF00307380
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DOI: https://doi.org/10.1007/BF00307380