STUDIES ON HORMONAL-CONTROL OF CIRCADIAN OUTER SEGMENT DISK SHEDDING IN RAT RETINA

  • 1 January 1978
    • journal article
    • research article
    • Vol. 17  (12) , 1189-1193
Abstract
Previous work suggested that the circadian burst of outer segment disc shedding occurring soon after the onset of morning light may be mediated by the pineal gland. The pineal glands of albino rats were either surgically removed or deafferented by bilateral superior cervical ganglionectomy in this study. Neither surgical procedure affected the burst of disc shedding at 2, 3 or 11 wk postoperatively. Neither hypophysectomy nor parathyroidectomy and thyroidectomy perturbed the burst of disc shedding. The burst of disc shedding apparently occurs independent of pineal, pituitary and parathyroid-thyroid gland control.

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