Early inhibition and changes in diurnal rhythmicity of the pituitary-thyroid axis after superior cervical ganglionectomy of rats.

Abstract

The effect of superior cervical ganglionectomy (SCGx) on the pituitary-thyroid axis was examined in rats. SCGx decreased serum thyrotropin (TSH) and thyroxine (T4) levels for up to 4 days after surgery, during and immediately after completion of anterograde degeneration of regional sympathetic terminals. At later times TSH levels in control and SCGx rats… (More)

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