Definitions
from The Century Dictionary.
- Connected with or representing elements of the quadrate and of the jugal or malar bone; common to these two bones: as, the quadratojugal arch; the quadratojugal articulation.
- noun A bone of the zygomatic arch of birds, etc., interposed between the quadrate bone behind and the jugal or malar bone before: generally a slender rod forming the hinder piece of the zygoma.
from the GNU version of the Collaborative International Dictionary of English.
- adjective Of or pertaining to the quadrate and jugal bones.
- adjective Of or pertaining to the quadratojugal bone.
- adjective (Anat.) a bone at the base of the lower jaw in many animals.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective anatomy Of or pertaining to the
quadrate andjugal bones. - adjective anatomy Of or pertaining to the quadratojugal bone.
- noun anatomy A small
jaw bone found in the skull of mostreptiles ,amphibians andbirds .
Etymologies
Sorry, no etymologies found.
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Examples
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Co-ossification of the epinasal, rostral, and epijugals unites several of the anterior (rostral-nasal-premaxillae) and lateral (jugal-quadratojugal) skull elements.
Archive 2008-04-01 ReBecca Foster 2008
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Co-ossification of the epinasal, rostral, and epijugals unites several of the anterior (rostral-nasal-premaxillae) and lateral (jugal-quadratojugal) skull elements.
Triceratops cranial epi-ossifications ReBecca Foster 2008
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The monitor lizards share a number of distinct features in the structure of their skulls with the modern snakes; both, for instance, possess a moveable quadrate bone at the back of the jaw, and both are missing the quadratojugal bone at the rear of the skull.
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Three arches were considered, which were named, commencing with the inferior in position: the quadratojugal, the zygomatic and the parietoquadrate.
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As this element in the Mammalia is intracranial, and does not give support to an arch, the zygomatic arch of that class could not be homologous with the arch which it (the quadrate) supports in the Reptilia (the quadratojugal).
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The zygomatic (quadratojugal) is greatly decurved posteriorly, and the supratemporal is accordingly decurved also.
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In a study of the osteology of the Permian reptile, Diopeus leptocepTialus Cope, J I came to the conclusion that the quadratojugal arch of that reptile is the zygomatic arch of the
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Thus the supratemporal of the lizards (squamosal Auct.) would be the equivalent of the quadratojugal of Sphenodon.
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(quadratojugal), or supramastoid, is visible, but whether they are wanting or fused with adjacent elements, examination of specimens will best show.
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