Summary
Varying degrees of monoamine oxidase (MAO) activity were noticed all along the hypothalamo-hypophyseal neurosecretory tract inC. batrachus. Intense activity was evident on the wall of the secretory cells of the adenohypophysis, neurons of the nucleus preopticus (NPO) and nucleus lateralis tuberis (NLT). However, MAO activity was also observed in the cytoplasm of some neurons in the ventromedian region of the NLT and groups of cells present in the neurohypophyseal ramifications of the pars intermedia. A strong accumulation of formazan granules in the median eminence (ME) and the neuroadeno interface lends further support to the view thatC. batrachus has a ME of both the tetrapodan and the teleostean type. The distributional pattern of MAO in the hypothalamus and hypophysis suggests that monoaminergic fibres are probably involved in the secretory mechanism of the releasing factors and pituitary hormones.
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Abbreviations
- AF:
-
Aldehyde fuchsin
- CNST:
-
Common neurosecretory trunk
- ME:
-
Median eminence
- NH:
-
Neurohypophysis
- NLT:
-
Nucleus lateralis tuberis
- NPO:
-
Nucleus preopticus
- NST:
-
Neurosecretory tract
- PPD:
-
Proximal pars distalis
- RPD:
-
Rostral pars distalis
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Joy, K.P., Sathyanesan, A.G. Distribution of monoamine oxidase (MAO) in relation to the hypothalamo-hypophyseal system of the teleost Clarias batrachus (L.). J. Neural Transmission 39, 47–61 (1976). https://doi.org/10.1007/BF01248765
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DOI: https://doi.org/10.1007/BF01248765