THE ROLE OF THE PINEAL GLAND AND OF ENVIRONMENTAL LIGHTING IN THE REGULATION OF THE ENDOCRINE AND REPRODUCTIVE SYSTEMS OF RODENTS

THE ROLE OF THE PINEAL GLAND AND OF ENVIRONMENTAL LIGHTING IN THE REGULATION OF THE ENDOCRINE AND REPRODUCTIVE SYSTEMS OF RODENTS

Studies were performed to determine whether the pineal gland and the photoperiod play an important role in the regulation of certain endocrine and reproductive functions of rats and hamsters. A specially designed instrument is described that simplifies and speeds removal of the pineal glands. The ma...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Reiter,Russel J, Hoffman,Roger A, Hester,Ralph J
Format: Report
Sprache:eng
Schlagworte:
ADRENAL GLANDS
Anatomy and Physiology
ENDOCRINE GLANDS
EXCISION
EYE
HAMSTERS
IODINE
OVARIES
PHOTOPERIODISM
PINEAL GLAND
RATS
REPRODUCTION(PHYSIOLOGY)
REPRODUCTIVE SYSTEM
RODENTS
TESTES
THIOUREA
THYROID GLAND
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Beschreibung
Zusammenfassung:Studies were performed to determine whether the pineal gland and the photoperiod play an important role in the regulation of certain endocrine and reproductive functions of rats and hamsters. A specially designed instrument is described that simplifies and speeds removal of the pineal glands. The major conclusions are: Exposure of hamsters to short daily photoperiods (1 to 2 hr/day) or removal of the eyes results in atrophy of the reproductive organs. Pinealectomy prevents this atrophy. Removal of one testis from a dark-exposed hamster prevents gonadal atrophy attendant on short daily photoperiods. The degree of compensatory adrenal enlargement following unilateral adrenalectomy in female albino rats kept in long or short daily photoperiods is similar. This response is not altered by removal of the pineal gland. (Author)