Sodium channels in the axolemma of unmyelinated axons: a new estimate.
The saturable uptake of tritium-labeled saxitoxin by the rat left cervical sympathetic trunk, which consists almost entirely of unmyelinated fibers, indicates that the density of sodium channels on the axolemma of these fibers is about 200 channels/microns 2.
D000818:Animals; D001369:Axons / Q000378:metabolism; D007473:Ion Channels / Q000378:metabolism*; D008297:Male; D008854:Microscopy, Electron; D051381:Rats; D011919:Rats, Inbred Strains; D012530:Saxitoxin / Q000378:metabolism; D012964:Sodium / Q000378:metabolism*; D013564:Sympathetic Nervous System / Q000378:metabolism* / Q000648:ultrastructure
D007473:Ion Channels; D012530:Saxitoxin; D012964:Sodium