What does the sagittal suture in the skull determine?

The sagittal suture is a fibrous joint that runs along the top of the skull, separating the left and right parietal bones. It plays a crucial role in the development and growth of the skull, allowing for the expansion of the brain during infancy and childhood. The timing of its closure can also influence cranial shape and may be associated with certain craniOSynostosis conditions if it fuses prematurely. Overall, it is important for maintaining the structural integrity of the skull as it protects the brain.