Muscarinic action of acetylcholine in the pigeon optic tectum.
Eighty visual units were extracellularly recorded from the pigeon optic tectum, and the effects of iontophoretically applied acetylcholine and its antagonists, atropine and tubocurarine, on these units were examined. The results showed that acetylcholine in the avian tectum functions as an excitatory transmitter or modulator and acts predominantly through a muscarinic mode of action.
D000109:Acetylcholine / Q000378:metabolism*; D000818:Animals; D010856:Columbidae / Q000378:metabolism; D011976:Receptors, Muscarinic / Q000378:metabolism; D013477:Superior Colliculi / Q000378:metabolism*
D011976:Receptors, Muscarinic; D000109:Acetylcholine