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Temporal fenestrae in relation to the other skull openings in the dinosaur Massospondylus, a type of diapsid. The supratemporal fenestra, also called the upper temporal fenestra, is positioned above the other fenestra and is exposed primarily in dorsal (top) view. In some reptiles, particularly dinosaurs, the parts of the skull roof lying ...
The elliptical upper temporal fenestra was visible only looking at the top of the skull. The left and right upper temporal fenestrae were separated by the sagittal crest, which would have provided lateral attachment surfaces for the jaw musculature in the living animal. [1] Diagrams showing the dentition of the upper and lower jaw
Location and quarry map of the only known specimen. ... with interpretive diagram (bottom) ... and jugal was the lateral temporal fenestra, another major skull opening.
The posttemporal fenestra (alternative spelling: post-temporal fenestra) is a paired opening located below the rear edge of the parietal of the skull roof and above the paroccipital process of the braincase. It possibly represents the exit of the occipital ramus of the ophthalmic artery. [98]: 30 prearticular
This schematic shows the skull viewed from the left side. The middle opening is the orbit of the eye; the opening to the right of it is the temporal fenestra. Synapsids evolved a temporal fenestra behind each eye orbit on the lateral surface of the skull. It may have provided new attachment sites for jaw muscles.
As a diapsid, Acerosodontosaurus had two holes known as temporal fenestrae on each side of the skull, behind the eyes. However, the lower temporal fenestra was not completely enclosed from below. In most early diapsids, such as Petrolacosaurus and Youngina , the lower edge of the lower temporal fenestra is formed by a bony bar composed of the ...
Skull diagram in top down and side-on views. Unlike the vast majority of lizards, the tuatara has a complete lower temporal bar closing the lower temporal fenestra (an opening of the skull behind the eye socket), caused by the fusion of the quadrate/quadratojugal (which are fused into a single element in adult tuatara) and the jugal bones of ...
Vancleavea breaks away from this standard, as its supratemporal fenestra has completely closed up during evolution, leaving only the huge lateral temporal fenestra. [2] The flat and heavily sculptured skull roof is formed by the paired frontal bones above the eyes and the parietal bones above the temporal fenestra. The connection between the ...