Neurosecretory Material and the Pituitary Portal Vessels

Arko, H; Kivalo, E

doi:10.1530/acta.0.0290009

Cited by 6 publications

(2 citation statements)

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“…2) Whereas the nerve fibres in the internal layer of the median eminence and in the posterior pituitary are both well stainable by Gomori's method, those in the external layer are generally not stained by this staining, except small number of"positive"fibres branching off from the main group of supraoptico-hypophyseal tract to the primary capillary plexus of portal veins (Arko and Kivalo, 1958;Okamoto and Ihara, 1960;Rinne, 1960). This difference in staining, though not qualitative but quantitative, suggest some different origin and nature of nerve fibres and of granules contained therein.…”

Section: Discussionmentioning

confidence: 99%

Electron Microscopic Observation on the Hypothalamohypophyseal System in the Rat

Kobayashi

Yamamoto

et al. 1968

Endocrinol Japon

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Section: Discussionmentioning

confidence: 99%

Electron Microscopic Observation on the Hypothalamohypophyseal System in the Rat

Kobayashi

Yamamoto

et al. 1968

Endocrinol Japon

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“…Thus it seems unlikely that the difference between Groups 1 and 2 and Group 4 in development of the seminiferous epithelium is related with the appearance of neurosecretory materials originating from the supraoptic and paraventricular nuclei in the posterior pituitary. However, several authors have suggested that the neurosecretory material may be involved in gonadotropin secretion (Arko and Kivalo, 1958;Fiske and Greep, 1959;Rinne, 1960;Viermann, 1962;Flament-Durand and Desclin, 1964).…”

Section: Testesmentioning

confidence: 99%

Spermatogenetic Activity after Early Postnatal Hypothalamic Lesion in Rats

1970

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Medio-basal hypothalamic lesions were made by electric coagulation in Sprague-Dawley strain rats 20-24 hours after birth. Testicular development in these animals was examined 20,40 and 60-70 days after birth. Transection (Group 1) or severe lesion (Group 2) of the pituitary stalk caused arrest of both spermatogenesis and testicular development. In these animals, on the 40th and 60th day after birth, the seminiferous tubules were very small in diameter and no spermatids or spermatozoa were found in the lumen. The seminiferous epithelium was very thin, and spermatogenesis was arrested in the premeiotic stage. Lesion of the posterior part of the median eminence, including the stalk (Group 4), also induced testicular atrophy, but spermatogenesis was not disturbed. Damage of the anterior portion of the median eminence (Group 3) did not cause testicular atrophy. When the median eminence and the stalk were intact, lesions of the hypothalamus, including the subthalamus, mamillary body and half the hypothalamus (Group 5), did not depress spermatogenesis. The hypophysis did not show any degeneration in all cases examined, although the size was very small in Groups 1 and 2. These findings suggest that development of testiculotropic function of the hypophysis is dependent on the hypothalamus, especially on the posterior medio-basal hypothalamus, even though the hypophysis grows independently of hypothalamic control.

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Comparative aspects of hypothalamic-hypophysial relationships

Jørgensen

Larsen

1960

Ergebnisse Der Biologie

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Neurosecretory Material and the Pituitary Portal Vessels

Cited by 6 publications

References 0 publications

Electron Microscopic Observation on the Hypothalamohypophyseal System in the Rat

Electron Microscopic Observation on the Hypothalamohypophyseal System in the Rat

Spermatogenetic Activity after Early Postnatal Hypothalamic Lesion in Rats

Comparative aspects of hypothalamic-hypophysial relationships

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