Abuur nooc ka mid ah weedhan adag ee ku saabsan nidaamka neerfaha ee lafdhabarta, unugyada neerfaha ee aadka u yar ayaa loo yaqaan'''aqoonsi'' dareenkan.
Dabcan, qaab kale oo adag oo weedha ah waa "In vertebrate nervous systems very few neurons are '' identified' in this sense - in humans, there are believed to be none - but in simpler nervous systems, some or all neurons may be thus unique".