Hypothalamic-hypophysial relationships in the South American lungfish Lepidosiren paradoxa
Identifieur interne : 000E27 ( Main/Exploration ); précédent : 000E26; suivant : 000E28Hypothalamic-hypophysial relationships in the South American lungfish Lepidosiren paradoxa
Auteurs : David Zambrano [Argentine] ; Fermín C. Iturriza [Argentine]Source :
- General and Comparative Endocrinology [ 0016-6480 ] ; 1972.
Abstract
An analysis of the anatomical relations between the hypothalamus and the hypophysis of the South American lungfish Lepidosiren paradoxa, has shown the coexistence of peptidergic fibers which end on the portal vessels of the median eminence and a direct adrenergic innervation of the glandular cells of the adenohypophysis. According to the internal structure and size of the elementary neurosecretory granules revealed by electron microscopy, three different types of peptidergic fibers contacting the capillary portal vessels of the median eminence are distinguished: (a) endings which contain electron dense granules about 140 nm in diameter and irregular shape, (b) endings containing smaller neurosecretory granules 120–130 nm in diameter, and (c) endings having elementary granules 140 nm in diameter and a much paler core. Although all these fibers seem to originate in the preoptic nucleus, the cell bodies of this nucleus invariably contain only one type of elementary neurosecretory granule, characterized by a diameter of 140–190 nm. The adrenergic fibers react positively to the Falck-Hillarp technique for the demonstration of catecholamines and are identified at the electron microscope level as fibers containing dense-cored granulated vesicles (DGV), 90–100 nm in diameter. These fibers, which seem to originate in numerous small neurons present in the median eminence, end in contact with glandular cells of the partes distalis and intermedia and are also present in large numbers in the zones of the pars nervosa contacting the pars intermedia. These findings suggest that the structural organization of the hypothalamic-hypophysial relationships in Lepidosiren is reminiscent of the situation found in most vertebrates having an indirect, neurovascular control, and that of teleosts, which have a more or less direct innervation of pituitary cells.
Url:
DOI: 10.1016/0016-6480(73)90177-9
Affiliations:
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According to the internal structure and size of the elementary neurosecretory granules revealed by electron microscopy, three different types of peptidergic fibers contacting the capillary portal vessels of the median eminence are distinguished: (a) endings which contain electron dense granules about 140 nm in diameter and irregular shape, (b) endings containing smaller neurosecretory granules 120–130 nm in diameter, and (c) endings having elementary granules 140 nm in diameter and a much paler core. Although all these fibers seem to originate in the preoptic nucleus, the cell bodies of this nucleus invariably contain only one type of elementary neurosecretory granule, characterized by a diameter of 140–190 nm. The adrenergic fibers react positively to the Falck-Hillarp technique for the demonstration of catecholamines and are identified at the electron microscope level as fibers containing dense-cored granulated vesicles (DGV), 90–100 nm in diameter. These fibers, which seem to originate in numerous small neurons present in the median eminence, end in contact with glandular cells of the partes distalis and intermedia and are also present in large numbers in the zones of the pars nervosa contacting the pars intermedia. These findings suggest that the structural organization of the hypothalamic-hypophysial relationships in Lepidosiren is reminiscent of the situation found in most vertebrates having an indirect, neurovascular control, and that of teleosts, which have a more or less direct innervation of pituitary cells.</div></front></TEI><affiliations><list><country><li>Argentine</li></country></list><tree><country name="Argentine"><noRegion><name sortKey="Zambrano, David" sort="Zambrano, David" uniqKey="Zambrano D" first="David" last="Zambrano">David Zambrano</name></noRegion><name sortKey="Iturriza, Fermin C" sort="Iturriza, Fermin C" uniqKey="Iturriza F" first="Fermín C." last="Iturriza">Fermín C. Iturriza</name><name sortKey="Iturriza, Fermin C" sort="Iturriza, Fermin C" uniqKey="Iturriza F" first="Fermín C." last="Iturriza">Fermín C. Iturriza</name><name sortKey="Zambrano, David" sort="Zambrano, David" uniqKey="Zambrano D" first="David" last="Zambrano">David Zambrano</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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