The Noradrenaline Content of the Varicosities of Sympathetic Adrenergic Nerve Terminals in the Rat

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Abstract
The noradrenaline (NA) content of the iris and vas deferens (1 cm) of the rat was determined spectrophotofluorimetrically. Using the histochemical fluorescence method of Hillarp and co‐workers the number of varicosities of adrenergic nerve terminals in iris and in 1 cm of vas deferens was estimated. It was found that the NA content per iris and in 1 cm of vas deferens was 4.7 and 310 ng as a mean, respectively. The amount of NA per varicosity was found to be about 4.2 × 10‐3 pg in the iris and about 5.9 × 10‐3 pg in the vas deferens. The concentration of NA in the varicosities was calculated to be in the order of 0.1–0.3 per cent, and the number of amine granules in a varicosity to be in the order of 1.500.