The pattern of autonomic innervation of the urinary bladder was studied in the cat, dog, rabbit and rat, using specific histochemical technics for acetylcholinesterase and norepinephrine. Cholinergic and adrenergic ganglion cells exist in all layers throughout the bladder wall. Large cholinergic and adrenergic nerve trunks coursing in the adventitial coat and deep lamina propria branch into the mus-
Techniques for the separate, consecutive and simultaneous demonstration of acetylcholinesterase and norepinephrine in cryostat sections are described and discussed. The results, obtained in a variety of tissues from different animal species, are as satisfactory—in terms of sensitivity and sharpness of localization—as those obtained by previously described methods. The simultaneous visualization of both acetylcholinesterase and norepinephrine in the same section provides hitherto unavailable data relative to the exact interrelationship of cholinergic and adrenergic components of the peripheral autonomic nervous system.
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