Question

why brain color is grey at outside​

Answer 1

Answer:

Because these cells are not surrounded by white myelin, they take on the natural grayish color of the neurons and glial cells.

Explanation:

Answer 2

Explanation:

These tracts transmit the electrical signals that the brain cells, called neurons, use to communicate. ... Because these cells are not surrounded by white myelin, they take on the natural grayish color of the neurons.