![]() ![]() The neurotransmitter of the preganglionic sympathetic neurons is acetylcholine ( ACh). ![]() Here they synapse with the highly-modified postganglionic cells that make up the secretory portion of the adrenal medulla. However, some of these preganglionic neurons pass right on through this second ganglion and into the adrenal medulla. Here it may synapse with postganglionic sympathetic neurons running to the smooth muscular walls of the viscera.
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