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'''Postorbital process''' is a [[bone]] structure found in the [[skull]] of certain [[animal]] species. It is a projection of the [[frontal bone]] or the [[jugal bone]], which forms part of the eye socket. The presence, absence, or form of the postorbital process can be used in the classification of species and understanding of their evolutionary history.

==Etymology==
The term "postorbital process" is derived from the Latin words "post", meaning "after", and "orbital", referring to the eye socket. The "process" part of the term refers to a projection or outgrowth on a bodily part or bone.

==Function==
The postorbital process serves to protect the eyes of the animal. It forms a bony ring around the eye socket, providing a barrier against physical damage. In some species, the postorbital process also plays a role in supporting the muscles that control eye movement.

==Variation among species==
The form of the postorbital process varies among different animal species. In some, it is a prominent and well-developed structure, while in others it is reduced or absent. The presence or absence of a postorbital process can be a significant characteristic in the classification of species.

For example, most [[mammal]]s have a postorbital process, but it is absent in [[rodent]]s and [[lagomorph]]s. Among [[reptile]]s, the postorbital process is present in [[lizard]]s and [[snake]]s, but is absent in [[turtle]]s.

==Evolutionary significance==
The postorbital process is of interest to [[paleontologist]]s and [[evolutionary biologist]]s, as changes in its form can provide clues about the evolutionary history of a species. For example, the transition from a well-developed postorbital process to a reduced or absent one can indicate changes in the animal's lifestyle or environment that made the protection of the eyes less important.

==See also==
* [[Orbit (anatomy)]]
* [[Skull]]
* [[Bone]]

[[Category:Anatomy]]
[[Category:Zoology]]
[[Category:Paleontology]]
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Postorbital process - Revision history

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