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[Catecholamine content in the wall of the thoracic duct of the dog during postnatal development].

Studies have been made on the content of catecholamines (norepinephrine, adrenaline, dihydroxyphenylalanine) in the wall of the thoracic lymphatic duct of puppies during their first 3 months of postnatal life. It was found that within this period, the content of norepinephrine increases, that of adrenaline remains unchanged, whereas dihydroxyphenylalanine is detected only in animals of the first month. The increase in norepinephrine content indicates gradual maturation of the adrenergic innervation in the wall of the lymphatic duct.