Etude histophysiologique du système hypothalamo-hypophysaire de Scyliorhinus caniculus (L.) en état de mélanodispersion permanente

Mellinger, J.

doi:10.1016/0016-6480(63)90043-1

Cited by 38 publications

(1 citation statement)

References 17 publications

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“…Indeed, since the pars intermedia of the elasmobranch has been shown to be under inhibitory control from the hypothalamus [Abramowitz 1939;Mellinger 1963], it is possible that the mechanism for control of hormone re lease may also be via inhibition through catecholamine fibers. The present study does not support a hypothesis for control of synthesis by nerve fibers in anurans.…”

Section: Significance Of Nerve Fibersmentioning

confidence: 99%

Ultrastructure of the Frog Pars Intermedia in Relation to Hypothalamic Control of Hormone Release

Saland

1968

Neuroendocrinology

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Section: Significance Of Nerve Fibersmentioning

confidence: 99%

Ultrastructure of the Frog Pars Intermedia in Relation to Hypothalamic Control of Hormone Release

Saland

1968

Neuroendocrinology

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Hypothalamo‐hypophyseal system in the minnow, Phoxinus phoxinus L. with a note on the effects of hypophysectomy

1969

J of Comparative Neurology

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The developmental differentiation OP the hypothalamo-hypophyseal system and its disposition in the adult normal minnow is described. Neurosecretory stainable material is present either as granules or droplets in the nucleus preopticus and it is suggested that they are related with one another and follow a sequence in their developmental appearance. This differentiation of the neuorsecretory material and its distribution along the preoptico-hypophyseal tract suggests a strong basis in support of the "transport-hypothesis" of Bargmann and Scharrer ('51). The presence of the Herring bodies and peripheral movement of the neurosecretory material along the axon is suggestive of the functional role performed by the tract in the process of storage and release of hormone into the circulation.The presence of intrathalamic branches of the optic nerve and their close association with neurosecretory fibers of the tract seem to be of significance in the important problem of retina-pituitary relationship.Injections of synthetic oxytocin, synthetic lysine vasopressin and a suspension of acetone-dried hypothalmus containing nucleus preopticus and the neurosecretory material have no effect on the color response in the minnow.The effect of hypophysectomy clearly confirms that the axons of the nucleus preopticus pass down to the neurohypophysis. After severe operational interruptions of the fibers, their trophic centers (the cell bodies of the nucleus preopticus) degenerate, The accumulation of the neurosecretory material in the stalk region after hypophysectomy supports the "transport-hypothesis."

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Seasonal changes in shark testicular structure and spermatogenesis

Parsons

Grier

1992

J. Exp. Zool.

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In this report, seasonal changes in testicular structure and spermatogenesis in several shark species are reviewed, and new information concerning the bonnethead shark, Sphyrna tiburo, is presented. Shark species are separated into four categories based on the relationship between testicular GSI and mating season: 1) species that have a defined seasonal cycle in GSI and a defined mating season, 2) species that have a defined seasonal cycle in GSI and that mate year-round, 3) species that show no seasonal change in GSI but that have a defined mating season, and 4) species that show no seasonal change in GSI but that mate year-round. The testis of S. tiburo differs from the few species that have been examined in that 1) not all spermatogenic stages are present at all times of the year, 2) a n annual zone of degeneration that progresses through the testis is not present, and 3) there appears to be complete testicular regression and recrudescence.

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Etude histophysiologique du système hypothalamo-hypophysaire de Scyliorhinus caniculus (L.) en état de mélanodispersion permanente

Cited by 38 publications

References 17 publications

Ultrastructure of the Frog Pars Intermedia in Relation to Hypothalamic Control of Hormone Release

Ultrastructure of the Frog Pars Intermedia in Relation to Hypothalamic Control of Hormone Release

Hypothalamo‐hypophyseal system in the minnow, Phoxinus phoxinus L. with a note on the effects of hypophysectomy

Seasonal changes in shark testicular structure and spermatogenesis

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