[Cholinergic contraction of the dog urinary bladder by electrical stimulation of the n. pelvicus and the ligamenta lateralia nerves and its affection by atropine and scopolaminebutylbromide (author's transl)].

As is well known contraction of the urinary bladder induced by electrical stimulation of the N. pelvicus-hypogastric plexus in the dog can only be diminished by atropine but not completely abolished. The result of stimulation can, however, be quantitatively abolished by the quaternary ammonium base hyoscine-n-butylbromide (scopolaminebutylbromide, Buscopan). Apart from antimuscarine-like peripheral effects, Buscopan also possesses, in contrast to atropine, antinicotine-like ganglion-blocking properties. Since Buscopan possesses only anticholinergic properties the contraction triggered off by stimulation of the nerve can be considered as being purely cholinergic. In the collateral ligaments of the urinary bladder of the dog there is another nervous system which when electrically stimulated contracts the bladder. Depending on the dosage the effect of stimulation can be diminished or abolished by atropine as well as by Buscopan. The result of stimulation can be diminished by hexamethonium and increased by eserine (physostigmine). Because of the effect of atropine-Buscopan (inhibition) and eserine (increase) this nervous system can be characterised pharmacologically as cholinergic.