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  • Frog  (1)
  • Gonadotropin-releasing hormone  (1)
  • Hypothalamo-hypophyseal control  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The function of fat bodies in relation to the hypothalamo-hypophyseal-gonadal axis in the frog, Rana esculenta (1975)
    Springer
    Cell & tissue research 161 (1975), S. 157-165 
    Details
    ISSN: 1432-0878
    Keywords: Fat bodies ; Frog ; Hypothalamo-hypophyseal control ; Testes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In this study the authors have tried to furnish experimental support for the importance of fat bodies in the normal functioning of the hypothalamo-hypophyseal-gonadal system of the male frog, Rana esculenta. These experiments have shown a hypothalamohypophyseal control of the mobilization of fat body contents, directly involved in the control of testicular activity. Furthermore it is proposed that the fat body contents are released into the testis through direct vascular contacts between the two organs. We suggest that the A1 cells (lactotrophs) and/or B2 cells (FSH-gonadotrops) of the pars distalis contain a factor responsible for the mobilization of fat body contents, and that the pars distalis gonadotropins are incapable of stimulating the testis in the absence of fat bodies. In the light of these results a scheme has been put forward showing the position of fat bodies in the hypothalamohypophyseal-gonadal axis of the frog.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220364
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Distribution of gonadotropin-releasing hormone-like peptides in the brain during development of juvenile male Rana esculenta (1991)
    Springer
    Cell & tissue research 265 (1991), S. 51-55 
    Details
    ISSN: 1432-0878
    Keywords: Brain ; Gonadotropin-releasing hormone ; Spermatogenesis ; Reproductive cycle ; Immunohistochemistry ; Development, ontogenetic ; Rana esculenta (Anura)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The distribution and density of cell bodies and fibers immunoreactive to GnRH-like peptides were investigated in the brain of male juvenile frogs (Rana esculenta) during postmetamorphic development. An immunohistochemical technique was used, involving antisera raised against 4 variants of GnRH: mammalian GnRH, chicken GnRH-I, chicken GnRH-II and salmon GnRH. A comparison of the immunohistochemical distribution at 8 different developmental stages shows that the maximum density of immunoreactive-GnRH elements, and the full distributional complexity of this system, is attained at the completion of spermatogenesis. Immunoreactive-GnRH cell bodies first appear in the anterior preoptic area during the metamorphic climax, and then appear sequentially in the medial septal area, tegmentum and, lastly, in the retrochiasmatic area and olfactory bulb when immunoreactive-fibers also reach the cerebellum. The GnRH system reacts positively to antisera for all 4 GnRH variants, but immunoreactivity for chicken GnRH-I is the weakest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318138
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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