Anatomie microscopique des noyaux hypothalamiques neuros�cr�toires et de leurs voies eff�rentes chez la Poule Rhode-Island

Neuronal characteristics and location of the neurosecretory, magnocellular, fuchsin-paraldehyde-posi-tive (FA+) system of the fowl are described at the light-microscopic level on serial semithin sections. Three nuclei make up this system, the nucleus supraopticus, n. magnocellularis interstitialis and n. paraventricularis. These nuclei display magnocellular neurons, not showing a parvocellular component. The neurons of the three nuclei showed a scattered pattern of distribution and a dense surrounding neuropil. Groups formed by magnocellular neurons were found in the three nuclei and groups formed by one magnocellular and a parvocellular neurons were only found in the n. magnocellularis interstitialis and in the n. paraventricularis.The presence of neurons in apposition to blood vessels was frequent in the magnocellular FA+ system of the domestic fowl.

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“…Pre vious light-microscopic studies have been carried out by other authors using the Gomori method [Legait, 1957: Oksche et al. 1959.…”

Section: Introductionmentioning

confidence: 99%

The Hypothalamic Magnocellular System in the Domestic Fowl

Tolivia¹,

Tolivia²,

Alvarez-Uría³

1987

Cells Tissues Organs

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The localization of vasotocin and neurophysin neurons in the diencephalon of the pigeon, Columba livia

Berk

Reaves

Hayward

et al. 1982

J of Comparative Neurology

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Vasotocin (VT)- and neurophysin (NP)-synthesizing neurons were demonstrated by immunocytochemistry in the diencephalon of the pigeon, Columba livia. Three diencephalic regions contain VT-NP cells: (1) periventricular preoptic area and hypothalamus, including nucleus periventricularis magnocellularis (PVM); (2) lateral preoptic area and hypothalamus; and (3) dorsal diencephalon. The immunoreactive cells in each of these three regions were divided into groups based on cytology and topography. No differences were found in the location of VT and NP cell groups. The periventricular region contains three continuous cell groups (P1-P3) extending from the posteroventral preoptic area to the anterodorsal hypothalamus and PVM. The lateral region has two cell groups composed of medium- to large-sized cells associated with the quintofrontal tract (L1) or with the optic tract (L2), while a third group (L3) lies between these two cell groups. Two accessory cell groups reside in the dorsolateral hypothalamus; L4 contains scattered cells of varied size, whereas L5 has small- to medium-sized cells clumped together. The dorsal diencephalic cell groups are found in the following locations: (1) lateral and dorsal to the lateral forebrain bundle (DD1); (2) in the area ventral to the dorsomedial anterior thalamic nucleus and dorsolateral to PVM (DD2); and (3) at the dorsolateral border of nucleus rotundus (DD3). To avoid potentially inaccurate mammalian homologies, the cell group nomenclature denotes topographic position. Nevertheless, the presence of VT-NP cells in PVM and projections to the brainstem and spinal cord suggest a homology between PVM and some of the parvocellular subnuclei of the mammalian paraventricular nucleus.

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Les voies extra-hypothalamo-neurohypophysaires de la neurosécrétion diencéphalique dans la série des Vertébrés

Legait

1958

Zweites Internationales Symposium Über Neurosekretion

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Anatomie microscopique des noyaux hypothalamiques neuros�cr�toires et de leurs voies eff�rentes chez la Poule Rhode-Island

Cited by 20 publications

References 4 publications

The Hypothalamic Magnocellular System in the Domestic Fowl

The Hypothalamic Magnocellular System in the Domestic Fowl

The localization of vasotocin and neurophysin neurons in the diencephalon of the pigeon, Columba livia

Les voies extra-hypothalamo-neurohypophysaires de la neurosécrétion diencéphalique dans la série des Vertébrés

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