Parietal Bone

00:02 Now let's look at the parietal bones.

00:05 So we have these lines called the superior temporal lines and inferior temporal lines.

00:10 That have to do with eventually a muscle called the temporalis in this area.

00:16 And there's this fossa or depression there.

00:19 That is going to give space for this temporalis muscle.

00:23 Which is a wide flat powerful muscle.

00:25 Because it's involved in chewing or mastication.

00:30 If we look on the interior surface, we see some grooves.

00:34 And here we see a groove for the superior sagittal sinus.

00:38 Which is one of the dural venous sinuses of the coverings of the brain.

00:43 And here we see that superior sagittal sinus sitting in that groove.

00:50 The parietal bone has borders with the frontal bone.

00:55 And it has a sagittal border where it borders its opposite parietal bone.

00:59 So the left and right parietal bones meet here.

01:03 We also have the inferior squamosal border so the squamous portion of the temporal bone sits there.

01:10 We also have the occipital border with the occipital bone.