See also: Evolution of mammalian auditory ossicles
A schematic of an anapsid skull showing the location of major dermal bones of the upper skull, including the quadrate bone (q).
The quadrate bone is a skull bone in most tetrapods, including amphibians, sauropsids (reptiles, birds), and early synapsids.
In most tetrapods, the quadrate bone connects to the quadratojugal and squamosal bones in the skull, and forms upper part of the jaw joint. The lower jaw articulates at the articular bone, located at the rear end of the lower jaw. The quadrate bone forms the lower jaw articulation in all classes except mammals.[1]
Evolutionarily, it is derived from the hindmost part of the primitive cartilaginous upper jaw.
^Romer, Alfred Sherwood, 1894-1973. (1978). The vertebrate body : shorter version. Parsons, Thomas S. (Thomas Sturges), 1930- (5th ed.). Philadelphia: Saunders. ISBN 0-7216-7682-0. OCLC 3345587.{{cite book}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link)
The quadratebone is a skull bone in most tetrapods, including amphibians, sauropsids (reptiles, birds), and early synapsids. In most tetrapods, the quadrate...
prearticular bones have fused to form the compound bone. The mandible is suspended from the quadratebone and articulates at this compound bone. In most tetrapods...
reptiles, the inner face of the quadratojugal also connects to the quadratebone which forms the cranium's contribution to the jaw joint. Early in their...
evolved from skull bones present in most tetrapods, including the reptilian lineage. The reptilian quadratebone, articular bone, and columella evolved...
quadrate and articular bones of the skull articulate to form the jaw joint. The squamosal bone lies anterior to the quadratebone. In non-mammalian synapsids...
up Quadrate or quadrate in Wiktionary, the free dictionary. Quadrate may refer to: QuadrateboneQuadrate (heraldry) Quadrate lobe of liver Quadrate tubercle...
supraorbital bone above the eye that contacted between the lacrimal and postorbital bones was eave-like, and similar to that of Abelisaurus. The quadratebone at...
cross ridges. There is a large spine on the parietal bone and there are spines on the lower quadratebone. The soft-rayed portion of the dorsal fin has between...
includes the maxillae, premaxillae, braincase, and quadratebone on the skull; and spine, hip bone, legs, and tail in post-cranial remains. It is the...
cranial kinesis. Likewise, the bones of the lower jaw would have been able to move against each other and the quadratebone could swing outwards, spreading...
articulation between the mandible and temporal bones, as opposed to articulation between articular and quadratebones. An intermediate stage can be seen in some...
jugal bone is only weakly developed and has a smooth surface. The convex quadratojugal bone overlaps the rear of the shaft of the quadratebone. The quadrate...
the quadrate, as in the Amblycephalidae; the supratemporal may be much reduced, and wedged in between the adjacent bones of the cranium; the quadrate may...
a crest on the underside of the palatine bone and two condyles on the mandibular process of the quadratebone, with the middle condyle beakwards of the...
The femur (/ˈfiːmər/; pl.: femurs or femora /ˈfɛmərə/), or thigh bone is the only bone in the thigh. The thigh is the region of the lower limb between...
body mass. Isolated bones suggest some M. hoffmannii may have exceeded the lengths of the Penza specimen. One such bone is a quadrate (NHMM 003892) which...
The complex anatomy of the bone renders it extremely diagnostic, even to the species level. In lateral view, the quadrate resembles a hook in immature...
This is made possible by a loose connection between the quadrate and its neighboring bones. Without this, snakes would not be able consume prey that...
impulse momentum where impulse is the integral of force over time. The quadratebone and joints play an important role in extending impact time, which decreases...
others boids. The quadratebone is oriented at a low angle and the articulation of both the palatine to pterygoid and pterygoid to quadrate are heavily reduced...
spinal nerves; e, notochord; g, quadratebone; h, hyomandibular bone; i, mandible; j. basibranchials; k, ribs; l, hyoid bone; I, II, III, IV, V, branchial...
wrinkled side surface of orbital border of the frontal bone, expanded and hooked quadratebone head on the posterior side, and a prominent tubercle developed...
and must periodically engage in molting. They also possess movable quadratebones, making possible movement of the upper jaw relative to the neurocranium...
lower jaw bone, which carries the teeth) and the squamosal (another small skull bone). In the Jurassic, their quadrate and articular bones evolved into...
the only extant amphibian known to exhibit streptostyly, and their quadratebone moves even after death. Different groups of reptiles exhibit varying...
that family. D. stirtoni was characterised by a deep lower jaw and a quadratebone (which connects the upper and lower jaws) that was distinctly shaped...
lower jaw consists of a much elongated quadratebone, a tiny compound bone, and a relatively larger dentary bone. The body is cylindrical with a blunt...
with a short, vertical quadratebone and rigid jaws; the coronoid bone is still present in the lower jaw. The orbital bones are absent, the supratemporal...
evolved from the articular bone of the lower jaw, and the incus, or "anvil", from the quadrate. In other vertebrates, these bones form the primary jaw joint...
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