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The squamosal is a skull bone found in most reptiles, amphibians, and birds. In fishes, it is also called the pterotic bone. [1] In most tetrapods, the squamosal and quadratojugal bones form the cheek series of the skull. [2] The bone forms an ancestral component of the dermal roof and is typically thin compared to other skull bones. [3]
The superior border is thin, and bevelled at the expense of the internal table, so as to overlap the squamous border of the parietal bone, forming with it the squamosal suture. Posteriorly, the superior border forms an angle, the parietal notch, with the mastoid portion of the bone.
Download as PDF; Printable version; In other projects Wikimedia Commons; Wikidata item; ... "Anatomy diagram: 34256.000-2". Roche Lexicon - illustrated navigator ...
Diagram showing the skull from above and the left side. The epiossifications on the squamosal bones of Kosmoceratops became progressively larger towards the back of the neck frill. There were five well-developed epiossifications per side on the hind-margin of the frill: three forward-curved epiparietals (ep 1–3) on the parietal bone, one ...
The mammalian jaw joint is composed of different skull bones, including the dentary (the lower jaw bone which carries the teeth) and the squamosal (another small skull bone). In mammals, the quadrate and articular bones have evolved into the incus and malleus bones in the middle ear. [20] [21]
The skull of Monquirasaurus is large and blunt, 2.45 m (8.0 ft) long from the snout tip to the posterior end of the right squamosal (2.65 to the posterior end of the retroarticular process of the mandible) and 1.2 m (3.9 ft) wide across the lateral margin of the quadrates. When viewed from the side the cranium is elongated and low, however it ...
Parietal and squamosal skull elements [79] Diabloceratops eatoni: UMNH VP 16699 [80] Natural History Museum of Utah [80] Early Campanian [81] Wahweap Formation, Utah [80] Partial skull and lower jaw [80] The skull, minus the lower jaw, in storage in Utah: Dracorex hogwartsia: TCMI 2004.17.1 [82] The Children's Museum of Indianapolis [82] Late ...
The skull is characterized by the small tabular without any trace of a "horn", but with a round lappet that approaches the squamosal flange lateral to the tympanic membrane, failing to meet it by about its own width. The occiput between the otic notches is proportionately wide, a reflection of the small size of the skull.