Abstract
1. The activity and characteristics of phenylethanolamine- transferase (PNMT) was studied in the large anterior chromaffin bodies (axillary bodies) of the spiny dogfish, Squalus acanthias. 2. The content of adrenaline and noradrenaline in plasma and various tissues was determined. Strees, induced by keeping the fish in air for 10 min, significantly increased plasma values of both adrenaline and noradrenaline. 3. Electrical stimulation for 1 min of the anterior part of the spinal cord caused release of endogneous adrenaline into the perfused posterior cardinal sinus. 4. The activity of the N-methylating enzyme measured in the large anterior axillary bodies was PNMT and not due to a non-specific N-methyl transferase. 5. It is concluded that adrenaline is synthetized, stored and released from the large anterior chromaffin bodies in the posterior cardinal sinus. The present study indicates that these chromaffin cells are innervated by nerve fibers originating from the central nervous system.
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