Advanced Technology may Solve Puzzles of Early Brain Development

Complexity of Brain

There are more than 100 billion neurons in a human brain. The transmission of information occurs through the complex network of axonal fibers that would stretch the entire 239,000 miles from the Earth to the Moon if connected end to end.

These connections/hardwiring happen before birth, as brains form folds that connect the neurons in random yet significant ways.

The team hopes to chart the formation of brain folds as faster-growing grey matter (the outer layer) grows on top of white matter (the inner layer that communicates between different gray matter areas and connecting it to the rest of the body).

“We don’t understand the underlying mechanism from the biological view, but we can say from the mechanical view that we have folds because we have mismatch in the growth rate of the layers. This is not just about the brain. If we have a multilayer system and the outer layer grows faster than the inner layers, then we will have instability and folding,” Razavi said.

The collaborated team obtained scans of 50 fetuses at 25 weeks and 36 weeks using standard magnetic resonance imaging (MRI) and brain-specific diffusion tensor imaging (DTI). This helped map the diffusion process of molecules within cells.

Further to this, the study plans to explore the expected growth and folding patterns of these 50 fetal brains through a computer model. This may also give insight into other factors involved.

Altogether these data may serve as a beginning step to understand some brain disorders, such as autism, schizophrenia, and polymicrogyria (in which the surface of the brain has many ridges or folds) and design better therapeutics.

Source: Medindia