ISSN:
1432-0878
Keywords:
Median eminence of birds
;
Thyrotrop function
;
Neurosecretion
;
Light-and electron microscopy
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary 1. The effects of TSH and PTU treatment with thyroid stimulating hormone and propylthiouracil on the structure of median eminence of the pigeon have been studied by light- and electron microscopy. 2. By light microscopy it has been found that the aldehydefuchsin positive material of the external layers of the anterior median eminence differs functionally from that of the neural lobe. 3. The light- and electron microscopic investigations revealed that the anterior and posterior median eminence differ both structurally and functionally. Specifically after the experimental interventions the considerable reaction can be observed only in the anterior median eminence. 4. Electron microscopically it appears possible that the aldehyde-fuchsin positive material of the anterior median eminence may be associated with the 1200–1500 Å—size granules. 5. The quantitative changes observed in the granular composition after the treatments show a close correlation with thyroid function, namely after treatment with thyroid stimulating hormone the relative quantity of the 1200–1500 Å—size granules increases markedly, while administration of propylthiouracil has the opposite effect and increases the relative quantity of the 1000 Å—size dense-core vesicles. They presumably may play a role in the control of TSH-secretion.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00307170
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