During a head injury or a trauma, the brain can limit the spread of the damage by forming a glial scar which seals off the damaged region from the rest of the important parts. During this process, the glial cells are particularly important. In specific, the glial cells Astrocytes will be the most abundant in this process since they produce glucose and other essential nutrients which help support the viability of the surviving cells. In addition, the astrocytes is responsible in maintaining the brain environment stability (homeostasis), supplying nutrition for neurons, and recycling neurotransmitters.
Therefore the answer to this question would be:
“Astrocytes”