Wiktionary
n. A very small, fine electrode, most often used to study the electrical behaviour of biological cells or tissues
Wikipedia
This article about application of microelectrodes in electrophysiology. For application in electroanalytical chemistry see ultramicroelectrode.
A microelectrode is an electrode of very small size, used in electrophysiology for either recording of neural signals or electrical stimulation of nervous tissue. Initially, pulled glass pipette microelectrode was used with later introduction of insulated metal wires. These microelectrodes are made from inert metals with high Young modulus such as tungsten, stainless steel, or Platinum-iridium alloy and coated with glass or polymer insulator with exposed conductive tips. More recent advances in lithography yielded to silicon based microelectrodes.
Usage examples of "microelectrode".
Now we drill the hole in your skull and use a microelectrode a long tube with a narrow tip encasing a filament to explore the area.
Zelazo commented, as he began inserting microelectrodes into the gyrate grayish-pink tissue of each brain.
Lettvin and his English colleague Pat Wall developed probing microelectrodes that could pick up the weak signals generated by the faintest firings of the smallest cells and fibers in the brain and nervous system.
As he experiences it, microelectrodes in his hypothalamus trigger sensitive neurons.
So, let's just imagine that Levshov is, some way or other, knocked out cold, and while he doesn't feel anything we do a little surgery on him: we implant microelectrodes into the nerve fibers that go from Levshov's brain to the muscles of his throat, as well as into his auditory nerve.