Langleys nicotine test
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The test is the following: First stimulate the preganglionic fiber and notice the response that appears. By adding a large dose of nicotine, the ganglion (site of relay between pre- and postganglionic fibers) is blocked. Now the preganglionic fiber is restimulated again.
Langley and his colleague William Dickinson found that in sympathetic ganglia, nicotine acts to selectively block nerve conduction, by causing an interruption between the pre-ganglionic and post-ganglionic nerve fibers. They were able to take this information and develop their test to determine the end points of different nerve fibers.
- MAEHLE, A.-H. (2004). “Receptive Substances”: John Newport Langley (1852–1925) and his Path to a Receptor Theory of Drug Action. Medical History, 48(2), 153–174.
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