pterygoid bone

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pterygoid bone

[′ter·ə‚gȯid]
(vertebrate zoology)
A rodlike bone or group of bones forming a portion of the palatoquadrate arch in lower vertebrates.
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The bones of the dermatocranium and the mandible are the first to begin the ossification process: squamosal, pterygoid, maxilla, dentary, coronoid, supra-angular and branchial horn I in stage 16, the frontal, jugal, postorbital, parietal, premaxilla and prefrontal in stage 17, and the palatine and quadratojugal in stage 19.
Squamosal delicate; anterior arm slender; posterior arm three fifths length of anterior arm, medial ala overlying dorsolateral surface of crista parotica; ventral arm well developed, distally articulating with quadratojugal laterally and posterior ramus of pterygoid medially.
6] Contrast enhancement also allows the tumor to be located precisely in reference to the medial and lateral pterygoid.
In the mandibular arch the quadrate and pterygoid are considered to be the dorsal homologs, while Meckel's cartilage is believed to correspond to the ventral homolog.
The masseter, temporalis, and medial pterygoid muscles elevate the mandible and therefore provide the major forces used for chewing and other jaw functions.
The muscle markings end at a bondy lip, which served as an anchor for the medial pterygoid, the Israeli researcher notes.
Other sites include a paranasal sinuses, orbital walls, temporal bone, pterygoid processes and external ear canal.
19-21) The superior portion of the lateral pterygoid is inaccessible to palpation whereas palpation of the inferior lateral pterygoid remains a contentious issue.
Pneumatization may extend into the greater and lesser wings of the sphenoid or pterygoid process and the anterior clinoid process; it can also extend into the occipital bone.
griseus has shorter, wider, and higher (specially at the braincase) cranium, with larger orbits and tympanic bullae, concave posterior borders of the palate, smaller temporal fossae, wider postorbital constriction, wider pterygoid fossae, and smaller postorbital processes of the frontal.