Abstract：
:The avian pineal exhibits a daily rhythm in the synthesis and secretion of the hormone, melatonin, which is involved in maintaining temporal order within the circadian system of some species. The pineal is richly innervated by sympathetic nerves which originate in the superior cervical ganglia (SCG) and, in the chicken, these nerves play a role in generating the melatonin rhythm. In the Japanese quail, the pineal melatonin rhythm can be entrained by light perceived directly by the pineal or by light perceived by the eyes. The role of the sympathetic innervation of the pineal was investigated in the Japanese quail by subjecting birds to bilateral superior cervical ganglionectomy (SCGX) and determining if SCGX either abolished the ability of retinally perceived light to entrain the pineal melatonin rhythm or if it disrupted the rhythm under constant darkness (DD). The results show that SCGX neither prevented entrainment of the pineal melatonin rhythm by retinally perceived light nor affected the rhythm expressed in DD. An entrainment pathway between the eyes and pineal exists in quail which does not involve the SCG.
journal_name
Brain Resjournal_title
Brain researchauthors
Barrett RK,Underwood Hdoi
10.1016/0006-8993(92)90636-nsubject
Has Abstractpub_date
1992-01-13 00:00:00pages
249-54issue
2eissn
0006-8993issn
1872-6240pii
0006-8993(92)90636-Njournal_volume
569pub_type
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