Parts of the heart have more neurons than parts of the brain.

The finding

What the evidence shows

The heart has its own nerve network of roughly 43,000 neurons. Some tiny brain clusters have fewer, for example the body clock region at about 10,000 per side, so the statement is technically defensible. It is misleading, though, because the whole brain holds about 86 billion neurons, millions of times more than the heart. This is a different claim from the earlier brain-neuron-count ruling, so that ruling does not apply here. A count showing the heart has fewer neurons than every identified brain region would flip this.