A new study has shown that the concept of the mammalian 'lizard brain' can be well and truly put to bed.
The idea of the lizard brain first emerged and rose to popularity in the 1960s and 1970s, based on comparative anatomical studies. Parts of the mammalian brain, neuroscientist Paul MacLean noticed, were very similar to parts of the reptilian brain. This led him to the conclusion that the brain had evolved in stages, after life moved to land., defined as the basal ganglia. Then came the limbic system – the hippocampus, the amygdala, and the hypothalamus. Finally, the neocortex arose in primates.
"Neurons are the most diverse cell types in the body. Their evolutionary diversification reflects alterations in the developmental processes that produce them and may drive changes in the neural circuits they belong to,"Around 320 million years ago was a very important time for the evolution of vertebrates and their brains.
They sequenced the RNA – a messenger molecule used as a template to form proteins – in individual cells from the brains of bearded dragons to determine the In other words, there was a core set of neuron types with similar transcriptomes that both mammals and reptiles have in common, even though they have been evolving separately for over 320 million years.
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