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An infratemporal fenestra, also called the lateral temporal fenestra or simply temporal fenestra, is an opening in the skull behind the orbit (anatomy), orbit in some animals. It is ventrally bordered by a zygomatic arch. An opening in front of the eye sockets, conversely, is called an antorbital fenestra. Both of these openings reduce the weight of the skull. Infratemporal fenestrae are commonly (although not universally) seen in the fossilized skulls of dinosaurs. Synapsids, including mammals, have one temporal fenestra, while sauropsids, the birds and reptiles, have two.
An infratemporal fenestra, also called the lateral temporal fenestra or simply temporal fenestra, is an opening in the skull behind the orbit (anatomy), orbit in some animals. It is ventrally bordered by a zygomatic arch. An opening in front of the eye sockets, conversely, is called an antorbital fenestra. Both of these openings reduce the weight of the skull. Infratemporal fenestrae are commonly (although not universally) seen in the fossilized skulls of dinosaurs. Synapsids, including mammals, have one temporal fenestra, while sauropsids, the birds and reptiles, have two.
References
{{ref list Dinosaur anatomy Foramina of the skull