Temporal fenestra

A skull opening behind the orbit that provides space for jaw muscles and associated structures. Its position and number help distinguish major amniote skull patterns.

Orbit (anatomy): A bony cavity in the skull that houses an eye. The temporal fenestra is defined by its position behind this opening.
Temporalis muscle: A broad muscle that elevates the mandible and helps close the jaw. It occupies the temporal region whose space fenestrae help provide.
Synapsid: An amniote lineage characterized ancestrally by one temporal opening on each side of the skull. Synapsids illustrate the single lower temporal opening pattern.
Synapsid evolution: The evolutionary history of the lineage that includes mammals and their extinct relatives. It traces changes from early synapsid fenestrae to mammalian skull anatomy.
Euryapsid: A traditional skull-pattern category with one upper temporal opening on each side. It contrasts with the usual synapsid and diapsid opening arrangements.
Skull: The bony or cartilaginous structure that encloses and protects the brain and supports the face. Temporal fenestrae are openings in this structure.
Masseter muscle: A powerful muscle that elevates the mandible during jaw closure. Its position and expansion relate to the skull’s temporal architecture.
Diapsid: An amniote lineage characterized ancestrally by two temporal openings on each side of the skull. Diapsids illustrate a two-opening pattern in the temporal region.
Diapsid evolution: The evolutionary history of reptiles with ancestral paired temporal openings, including birds. It follows the diversification of the two-opening skull pattern.
Temporal fenestration: The presence, number, and arrangement of openings in the temporal region of an amniote skull. This broader anatomical pattern includes the individual temporal fenestra.

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