ethmoid

Definitions

  • WordNet 3.6
    • n ethmoid one of the eight bones of the cranium; a small bone filled with air spaces that forms part of the eye sockets and the nasal cavity
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Webster's Revised Unabridged Dictionary
    • a Ethmoid (Anat) Like a sieve; cribriform.
    • n Ethmoid (Anat) The ethmoid bone.
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Century Dictionary and Cyclopedia
    • ethmoid Sieve-like; cribriform: in anatomy specifically applied to a bone of the skull. See II.
    • ethmoid Specifically, pertaining to the ethmoid: as, the ethmoid region of the skull.
    • n ethmoid A bone of the cranium, situated in the middle line of the skull, in advance of the sphenoid, above the basicranial axis, transmitting the filaments of the olfactory nerve, and constituting the bony skeleton of the organ of smell: so called because, in the human subject and mammalia generally, it has a cribriform plate perforated with numerous holes for the passage of the olfactory nerves. The human ethmoid is comparatively small, of a cubical figure, with its cribriform plate horizontal. It consists of a median perpendicular plate or mesethmoid, and of the horizontal or cribriform plate, from which latter the main body of the bone depends on either side, forming the so-called lateral masses, or ethmoturbinals. The texture of these is extremely light and spongy, full of large cavities connecting with the frontal and sphenoidal sinuses, and lined with mucous membrane, the Schneiderian membrane, upon which the olfactory nerves ramify after leaving the cavity of the cranium through the holes in the cribriform plate. (See cut under nasal.) The so-called os planum of the ethmoid is simply the exterior surface of these lateral masses, which contributes to the inner wall of the orbit of the eye. The lateral masses are each partially divided into two, called the superior and middle turbinate bones, or scroll-bones (the inferior turbinate being a different bone), which respectively overlie the corresponding nasal meatuses. (See cut under mouth.) The ethmoid is wedged into the ethmofrontal notch of the frontal bone, and also articulates with the vomer, sphenoid, sphenoturbinals, nasals, maxillaries, lacrymals, palatals, and maxilloturbinals. It is developed from three ossific centers, one for the perpendicular plate, and one for each lateral mass. In other animals the ethmoid exhibits a wide range of variation in size, shape, and connections, and below mammals loses much or all of the particular characters it presents in man. (See cut under Esox.) It is relatively larger and more complicated in mammals of keen scent, as carnivores and ruminants.
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Chambers's Twentieth Century Dictionary
    • adj Ethmoid resembling a sieve
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Etymology

Webster's Revised Unabridged Dictionary
Gr. like a sieve; sieve + from: cf. F. ethmoïde, ethmoïdal,
Chambers's Twentieth Century Dictionary
Gr. ēthmos, a sieve, and eidos, form.

Usage

In literature:

Worms lodging in the cribriform plate of the ethmoid feed on the soft tissues of that region.
"Anomalies and Curiosities of Medicine" by George M. Gould
The ethmoid bone is situated between the bones of the cranium and those of the face, just at the root of the nose.
"A Practical Physiology" by Albert F. Blaisdell
ETHMOIDAL SINUSES, illustrated, 7; function of, 12.
"Resonance in Singing and Speaking" by Thomas Fillebrown
Sometimes the perpendicular plate of the ethmoid is implicated, and the fracture in this way comes to involve the base of the skull.
"Manual of Surgery Volume Second: Extremities--Head--Neck. Sixth Edition." by Alexander Miles
Crista galli of ethmoid bone.
"Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 4" by Various
The ethmoid frequently appears on the dorsal surface between the frontals.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 7" by Various
The ethmoid is large and has a flange laterally.
"A Review of the Middle American Tree Frogs of the Genus Ptychohyla" by William E. Duellman
The ethmoid is large and completely ossified; the margins are smooth.
"Neotropical Hylid Frogs, Genus Smilisca" by William E. Duellman
The needle had not entered the brain, but the ethmoid was very much injured.
"A Treatise on Sheep:" by Ambrose Blacklock
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In news:

Endoscopic view of an asymmetric roof of the ethmoid sinus.
Isolated cementoossifying fibroma of the ethmoid bulla : A case report.
A case of extranasopharyngeal angiofibroma of the ethmoid sinus: A distinct clinical entity at an unusual site.
Osteoid osteoma of the ethmoid sinus: A rare diagnosis.
Endoscopic view of the ostium of the posterior ethmoid sinus.
Endoscopic view of an asymmetric roof of the ethmoid sinus .
Osteoid osteoma of the ethmoid sinus : A rare diagnosis.
Endoscopic view of the ostium of the posterior ethmoid sinus .
Correlation of the ethmoid infundibulum to the medial orbital wall in maxillary sinus hypoplasia: "Infundibular lateralization," a diagnostic CT finding.
Correlation of the ethmoid infundibulum to the medial orbital wall in maxillary sinus hypoplasia: "Infundibular lateralization ," a diagnostic CT finding.
The leading symptoms are unilateral proptosis with ophthalmalgia, double vision or decreased acuity, a palpable mass in the superior medial aspect of the orbit or medial canthus with the fronto-ethmoidal mucoceles , and headaches.
Osteoid osteoma of the ethmoid sinus: A rare diagnosis.
IntroductionOsteoid osteomas are benign osseous lesions that are extremely rare in the ethmoid sinuses.
Cholesteatoma of the nose and maxillary and ethmoid sinuses: A rare complication of palatal surgery.
Noncontrast CT scans commonly demonstrate hypoattenuating mucosal thickening or soft tissue attenuation within the lumen of the sinus , with predilection for unilateral involvement of the ethmoidal and sphenoidal sinuses .
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