Our brain evolved from two primitive nervous systems that merged: Study

Researchers at Stanford University discovered that the human brain evolved from two separate primitive nervous systems that merged hundreds of millions of years ago, with the front and back brain regions developing from distinct cell types rather than a shared origin. This finding, confirmed through studies of mouse embryos and human cells, explains previous difficulties in growing hindbrain tissue in laboratories and now enables scientists to create functional human hindbrain neurons for research into diseases like ALS and spinal muscular atrophy.