The Intraparietal Sulcus (IPS) can be a continuous or interrupted sulcus on the parietal parenchyma, usually parallel to interhemispheric sulcus and separating the superior from the inferior parietal lobules. The IPS is related anteriorly with the post central sulcus (PCS) and posteriorly it usually continues with the transverse occipital sulcus.

It is important to locate the IPS/PCS meeting point because:

1- Anteriorly to this point we find the postcentral gurys.

2- It can be use in a neurosurgical procedure as a safe starting point for the transulcal or transcortical opening.

3- It is related on its depth to the ventricular trigone.

The IPS/PCS craniometrical point is located 6 cm anterior to Lambda and 5 cm lateraly to the sagittal suture.