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Circadian Rhythmicity in Photoperiodically Induced Gonadotrophin Release and Gonadal Growth in the Quail (1969)

FOLLETT, B. K. ; SHARP, P. J.

[s.l.] : Nature Publishing Group

Nature 223 (1969), S. 968-971

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] All birds were reared under a non-stimulatory photo-period of 6 h light per day (6L/18D), the experimental schedules being started at either 21 or 28 days of age. They were usually killed when the combined testicular or ovarian weight was 1,000 or 100 mg respectively; this ensured that the rate (k) ...

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/223968b0

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The distribution of monoamines in the hypothalamus of the Japanese quail Coturnix coturnix japonica (1968)

Sharp, P. J. ; Follett, B. K.

Springer

Cell & tissue research 90 (1968), S. 245-262

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ISSN: 1432-0878

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary The distribution of monoamines in the hypothalamus of the Japanese quail (Coturnix coturnix japonica) has been studied using a histochemical fluorescence technique. In the posterior hypothalamus catecholamine-containing nerve fibres are localised in the nucleus tuberis and nucleus hypothalamicus posterior medialis and are linked by fluorescent tracts running in the stratum cellulare internum. Further tracts may be traced from the nucleus tuberis around the base of the third ventricle to the sub-ependymal layer of the median eminence, where they then appear to pass through the hypothalamo-hypophysial neurosecretory tract to terminate in the palisade zone on the portal vascular bed. The innervation of the palisade layer by catecholamines is sparse. The fluorescent terminals are spread evenly throughout both the anterior and posterior divisions of the median eminence. There is no monoamine innervation of the pars nervosa. The paraventricular organ has both 5-hydroxytryptamine- and catecholamine-containing cell bodies and axons may be traced into the region of the nucleus hypothalamicus posterior medialis. In the anterior hypothalamus the neurosecretory paraventricular nucleus contains many catecholamine nerve fibres and terminals. These are linked by fibre tracts to the nucleus basalis and to the nucleus hypothalamicus posterior medialis. The supraoptic nucleus is less well innervated although a dense accumulation of fibres lies in the preoptic recess. The latter is thought to give rise to long axons which pass in association with the neurosecretory tract to end in the nucleus tuberis.