Squamosal border of parietal bone

The term ‘squamosal border of parietal bone’ refers to the lateral edge of this curved, rectangle-shaped bone. This border is divided into three parts:

• The anterior part, known as the sphenoparietal suture, is where the lower front corner of the parietal bone meets the greater wing of the sphenoid bone. In this area, two more bones, the frontal and temporal, also join, forming a meeting point for four bones on the side of the skull. This area is known as the pterion.

• The middle part, which is the largest, is called the squamous suture. This is where the parietal bone connects with the squamous part of the temporal bone.

• The posterior part, or the third part, is termed the parietomastoid suture. It’s the point at which the parietal bone joins with the mastoid part of the temporal bone.