Squamosal

Definitions

  • Webster's Revised Unabridged Dictionary
    • a Squamosal (Anat) Scalelike; squamous; as, the squamosal bone.
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Century Dictionary and Cyclopedia
    • squamosal Scale-like or squamous: noting only the squamosal, See II.
    • n squamosal In zoology and anatomy, the squamous division of the temporal bone; the thin, expansive, scale-like element of the compound temporal bone; a membrane-bone, morphologically distinct from other parts of the temporal, filling a gap in the cranial walls, articulating in man and mammals with the lower jaw, in birds and reptiles with the suspensorium (quadrate bone) of the lower jaw, effecting squamous suture with various cranial bones, and forming by its zygomatic process in mammals a part of the zygoma, or jugal bar. It is remarkably expansive in man. See cuts under Acipenser. acrodont, Balænidæ, craniofacial, Crotalus, Cyclodus, Felidæ, Gallinæ, Ichthyosauria, Ophidia, Physeter, Pythonidæ, Rana, and skull.
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Chambers's Twentieth Century Dictionary
    • ns Squamosal the squamous portion of the temporal bone
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Etymology

Chambers's Twentieth Century Dictionary
L. squamosussquama, a scale.

Usage

In literature:

The quadrate cartilage of the frog is superseded by the squamosal as the suspensorium of the lower jaw.
"Text Book of Biology, Part 1: Vertebrata" by H. G. Wells
Squamose -ous: scaly or covered with scales.
"Explanation of Terms Used in Entomology" by John. B. Smith
Squamose: Scaly, covered with scales.
"The Elements of Bacteriological Technique" by John William Henry Eyre
The pileus at the top is from one to two inches broad, fleshy, elongated funnel-form or trumpet-shape, floccose-squamose, ochraceous-yellow.
"The Mushroom, Edible and Otherwise" by M. E. Hard
The bones of origin included jugal, postorbital, postfrontal, parietal and squamosal.
"The Adductor Muscles of the Jaw In Some Primitive Reptiles" by Richard C. Fox
Near the anteroventral edge of the squamosal there is a small pit, probably related to a postorbital sensory pore in the skin.
"A New Order of Fishlike Amphibia From the Pennsylvanian of Kansas" by Theodore H. Eaton
The bony part of the prooetic is separated dorsally from the squamosal by the cartilaginous crista parotica.
"The Systematics of the Frogs of the Hyla Rubra Group in Middle America" by Juan R. León
P. squamose, naked, grey, 1 cm.
"European Fungus Flora: Agaricaceae" by George Massee
Part of one squamosal is preserved.
"A New Genus of Pennsylvania Fish (Crossoperygii, Coelacanthiformes) from Kansas" by Joan Echols
But the squamosal bone with which it always unites is in less close union with the brain case, and never covers the brain itself.
"Dragons of the Air" by H. G. Seeley
The anterior process of the squamosal is short and widely separated from the maxillary.
"A Review of the Middle American Tree Frogs of the Genus Ptychohyla" by William E. Duellman
The squamosal is attached dorsoventrally to the posterior part of the parietal and to the lateral part of the prootic.
"A Revision of Snakes of the Genus Conophis (Family Colubridae, from Middle America)" by John Wellman
The squamosals of all species are moderately large structures having otic plates that overlie the lateral portion of the cristae paroticae.
"A Synopsis of Neotropical Hylid Frogs, Genus Osteocephalus" by Linda Trueb
The ventral arms of the squamosal and the supraoccipital region of the exoccipital are the first occipital bones to appear.
"Neotropical Hylid Frogs, Genus Smilisca" by William E. Duellman
The periotic and tympanic are welded together, but not with the squamosal.
"Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 6" by Various
In the mammals the articulation of the lower jaw is with the squamosal.
"The Cambridge Natural History, Vol X., Mammalia" by Frank Evers Beddard
Breadth at the squamosals twice the height at basi-temporal.
"Trees. A Woodland Notebook" by Herbert Maxwell
Breadth at the squamosals twice the height at basi-temporal.
"Extinct Birds" by Walter Rothschild
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