Squamosal border

The lateral or squamous border (Margo squamosus) of the parietal bone connects to the squamous part of the temporal bone by a rough laminated surface that bevels its external surface.

Caudally, it rises against the petrous part of the temporal bone and contributes to form the temporal meatus (Meatus temporalis)* in the species where it exists. 

*The temporal meatus is carved between the base of the occipital process of the temporal bone and the parietal bone.

In Pigs Cats, Men, it is reduced

in other species, this canal is usually important.

It lodges the temporal veinous sinus and meningeal arterial branches. It begins inside the cranium, near the base of the internal occipital protuberance and ends at the retro-auricular foramen after a irregular curved path. Several secondary vascular canals connect to it on its path: some of these cross the squamous part to open on the temporal fossa and other end in the cranial cavity. In Bulls, the temporal meatus is carved in the thickness of the squamous part.