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Antorbital fenestra

 

 
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Antorbital fenestra
 
 
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An antorbital fenestra is an opening in the skull
Skull

The skull is a bone structure found in the head of many animals. The skull supports the structures of the face and protects the head against injury....
, in front of the eye sockets. This skull formation first appeared in archosaur
Archosaur

Archosaurs are a group of diapsid reptiles represented by modern birds and crocodilians. This group also includes extinct non-avian dinosaurs, pterosaurs and relatives of crocodiles....
s during the Triassic Period. Living birds today possess antorbital fenestrae, but the feature has been lost in modern crocodilians. In some archosaur species, the opening has closed but its location is still marked by a depression, or fossa
Fossa

Fossa is the Latin language word for ditch or trench. It can refer to one of the following:...
, on the surface of the skull. This is called an antorbital fossa.








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An antorbital fenestra is an opening in the skull
Skull

The skull is a bone structure found in the head of many animals. The skull supports the structures of the face and protects the head against injury....
, in front of the eye sockets. This skull formation first appeared in archosaur
Archosaur

Archosaurs are a group of diapsid reptiles represented by modern birds and crocodilians. This group also includes extinct non-avian dinosaurs, pterosaurs and relatives of crocodiles....
s during the Triassic Period. Living birds today possess antorbital fenestrae, but the feature has been lost in modern crocodilians. In some archosaur species, the opening has closed but its location is still marked by a depression, or fossa
Fossa

Fossa is the Latin language word for ditch or trench. It can refer to one of the following:...
, on the surface of the skull. This is called an antorbital fossa.

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