[Biogenic monoamines of the brain and spinal cord pia mater in vertebrates]

Fluorimetric studies have been made on the content of adrenalin, noradrenaline, serotonin, dopamine, and tryptamine in the pial matter of the brain and spinal cord of fishes, birds and mammals including man. Using histochemical method with glyoxylic acid, biogenic monoamines were revealed in the adrenergic nerve fibers and monoaminocytes. Their total content in the pial matter of the brain is approximately the same in all vertebrates, being significantly lower in man. Higher concentration of adrenergic axons and lower amount of monoaminocytes in human subjects reveal the key role of the nervous influences in regulation of hemodynamics of the brain.