What forms the sagittal, coronal, squamous, and lambdoid sutures?

Cranial Sutures:

Coronal suture is a articulation between the parietal bone and frontal bone;
Sagittal suture is a articulation between the Parietal bones;
Lambdoid suture is a articulation between the Parietal bone and the occipital bone;
Squamous suture is between the parietal bone and Temporal bone;

Cell wall permeability changes and sodium rushes into the cell.