The brain (the brain stem is one of the main components of the central nervous system regulator) is the main human organ, consisting of 20-25 billion neurons.
Ubuchopho (stem ubuchopho ingenye yezingxenye eyinhloko isimiso sezinzwa esiyinhloko Regulator) - Umzimba womuntu main ehlanganisa izinzwa 20-25 bhiliyoni.