Summary
The carotid and aortic-abdominal bodies of two human fetus at fifth month of pregnancy have been studied with the light and electron microscope. A personal variation of the glutaraldehyde ammoniacal silver (GA/S) method has been used, which consists in performing the silver reaction on the ultramicrotomical sections of the tissues, first fixed by glutaraldehyde perfusion and then included in Epikote 812.
In the light microscope, the GA/S reaction is certainly positive in the aortic-abdominal bodies and it is negative or dubious in the carotid bodies. — In the electron microscope, however, the reaction is positive both in the aortic-abdominal and in the carotid bodies. — In the aortic-abdominal bodies, the silver precipitate accumulates into thick cytoplasmic granules, which have been shown to be NA-storing granules. — In the carotid bodies however, the silver precipitate accumulates into much smaller cytoplasmic granules, which are interpreted as 5-HT-storing granules.
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Battaglia, G. Ultrastructural observations on the biogenic amines in the carotid and aortic-abdominal bodies of the human fetus. Z. Zellforsch. 99, 529–537 (1969). https://doi.org/10.1007/BF00340944
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DOI: https://doi.org/10.1007/BF00340944