Stanford scientists discover the human brain may actually be two separate organs
New research from Stanford Medicine challenges the long-held belief that the brain develops from a single progenitor cell population, suggesting it's actually built from two distinct nervous systems that evolved separately. One system handles essential functions like breathing, while the other is responsible for higher-level abilities such as language and abstract thought.
Why it matters
This discovery fundamentally alters our understanding of brain development, potentially explaining difficulties in growing certain brain cells and opening new avenues for investigating neurological diseases like SMA and ALS.
Scientists have long treated the brain as a single organ with a shared developmental origin. New research led by Stanford Medicine challenges that basic assumption, suggesting that what we call the brain is actually built from two distinct systems that arose separately over hundreds of millions of years of evolution.
For decades, the dominant model held that the entire brain develops from one early progenitor cell population. Under that view, the forebrain, midbrain, and hindbrain all trace back to the same developmental starting point.
The new findings point to a very different picture. Researchers found that the human brain appears to combine two ancient nervous systems. One gives rise to structures responsible for essential functions such as breathing and controlling the heartbeat. The other produces regions associated with abilities such as language, mathematics, abstract thought, and reflection on our own existence.
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