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The distribution of corticotropin-releasing factor-immunoreactive neurons and nerve fibers in the brain of the snake, Natrix maura

Coexistence with arginine vasotocin and mesotocin

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Summary

The anatomical distribution of neurons and nerve fibers containing corticotropin-releasing factor (CRF) has been studied in the brain of the snake, Natrix maura, by means of immunocytochemistry using an antiserum against rat CRF. To test the possible coexistence of CRF with the neurohypophysial peptides arginine vasotocin (AVT) and mesotocin (MST) adjacent sections were stained with antisera against the two latter peptides. CRF-immunoreactive (CRF-IR) neurons exist in the paraventricular nucleus (PVN). In some neurons of the PVN, coexistence of CRF with MST or of CRF with AVT has been shown. Numerous CRF-IR fibers run along the hypothalamo-hypophysial tract and end in the outer layer of the median eminence. In addition, some fibers reach the neural lobe of the hypophysis. CRF-IR perikarya have also been identified in the following locations: dorsal cortex, nucleus accumbens, amygdala, subfornical organ, lamina terminalis, nucleus of the paraventricular organ, nucleus of the oculomotor nerve, nucleus of the trigeminal nerve, and reticular formation. In addition to all these locations CRF-IR fibers were also observed in the lateral septum, supraoptic nucleus, habenula, lateral forebrain bundle, paraventricular organ, hypothalamic ventromedial nucleus, raphe and interpeduncular nuclei.

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Authors and Affiliations

  1. Departmento de Biología Celular y, Facultad de Ciencias, E-29071, Málaga, España

    J. M. Mancera, M. D. López Avalos & J. M. Pérez-Fígares

  2. Departamento de Fisiología Animal, Facultad de Ciencias, E-29071, Málaga, España

    P. Fernández-Llebrez

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  1. J. M. Mancera
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Mancera, J.M., López Avalos, M.D., Pérez-Fígares, J.M. et al. The distribution of corticotropin-releasing factor-immunoreactive neurons and nerve fibers in the brain of the snake, Natrix maura . Cell Tissue Res 264, 539–548 (1991). https://doi.org/10.1007/BF00319043

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