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Histomorphological studies on the neurosecretory system of three genera of freshwater teleostean fishes

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Proceedings / Indian Academy of Sciences

Abstract

The pre-optic nucleus ofClarias batrachus is club-shaped and that ofHeteropneustis fossilis is spindle-shaped and the neurons in both take on a brilliant hue with aldehyde fuchsin stain. On the other hand, the nuclei are bizarre with diffuse neurons inOphiocephalus punctatus. The pre-optic nuclei themselves are located anterior to the emergence of the optic nerve inO. punctatus while in the other two fishes they occupy positions posterior to it. A single neuron on the dorso-lateral aspect of the spindle inH. fossilis distorts its regular shape.

The hypothalamo-hypophysial tract inC. batrachus andH. fossilis have an anterior bend and mingle with the optic nerve fibres before coursing caudad while inO. punctatus it takes on a straight posterior course. The distal parts of the tract inC. batrachus andH. fossilis pass through the middle of the adeno-hypophysis while inO. punctatus it lies bordering the infundibular recess giving off fuchsionphil haemofibres which mingle with capillary network and have a parallel course in between the cells of pars-distalis, thus making it resemble the ‘Median Eminence’ of higher vertebrates.

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Abbreviations

AF:

Aldehyde fuchsin

PMC:

Parsmagnocellularis

PPC:

Parsparvocellularis

PON:

Preoptic nucleus

NL:

Neural lobe

ML:

Middle lobe

AL:

Anterior lobe

SV:

Saccus vasculosus

HHT:

Hypothalamo-hypophysial tract

BL:

Blood vessel

NSM:

Neurosecretory material

NLT:

Nucleus lateralis tuberis

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Authors and Affiliations

  1. Surgical Research Laboratory, Institute of Medical Sciences, Banaras Hindu University, Varanasi-5

    K. Chandrasekhar & D. Khosa

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  1. K. Chandrasekhar
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  2. D. Khosa
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Additional information

Communicated by Prof. K. Pampapathi Rao,f.a.sc.

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Chandrasekhar, K., Khosa, D. Histomorphological studies on the neurosecretory system of three genera of freshwater teleostean fishes. Proc. Indian Acad. Sci. 75, 257–265 (1972). https://doi.org/10.1007/BF03045719

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