EVERYDAY SCIENCE

Detailed explanation-1: -Synapsids, including mammals, have one temporal fenestra, which is ventrally bordered by a zygomatic arch composed of the jugal and squamosal bones. This single temporal fenestra is homologous to the infratemporal fenestra, as displayed most clearly by early synapsids.

Detailed explanation-2: -The diapsid skull has two temporal fossa, the supratemporal fossa (upper) and the infratemporal fossa (lower) which is separated by two bones i.e. postorbital and squamosal.

Detailed explanation-3: -Temporal fenestrae are post-orbital openings in the skull that allow muscles to expand and lengthen. Anapsids have no temporal fenestrae, synapsids have one, and diapsids have two. Anapsids include extinct organisms and may, based on anatomy, include turtles.

Detailed explanation-4: -In these animals, two temporal fenestrae exist on either side of the skull. In reptiles with fully diapsid skulls, the upper temporal fenestra is dorsally bordered by the parietal bone, anteriorly by the postorbital bone, and posteriorly by the squamosal bone.