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1. sievelike; cribriform.

eth·moid bone

an irregularly shaped bone lying between the orbital plates of the frontal bone and anterior to the sphenoid bone of the cranium; it consists of two lateral ethmoidal labyrinths of thin plates enclosing air cells, attached above to a perforated horizontal lamina, the cribriform plate, from which descends a median, vertical, perpendicular plate in the interval between the two labyrinths; the bone articulates with the sphenoid, frontal, maxillary, lacrimal, and palatine bones, the inferior nasal concha, and the vomer; it enters into the formation of the anterior cranial fossa, the orbits, and the nasal cavity, forming the supreme, superior, and middle conchae of the latter.


/eth·moid/ (eth´moid)
1. sievelike; cribriform.
2. the ethmoid bone; see Table of Bones. .ethmoi´dal


(ĕth′moid′) also


Of, relating to, or being a light spongy bone located between the ocular orbits, forming part of the walls and septum of the superior nasal cavity, and containing numerous perforations for the passage of the fibers of the olfactory nerves.
The ethmoid bone.


Etymology: Gk, ethmos, sieve, eidos, form
1 pertaining to the ethmoid bone.
2 having a large number of sievelike openings.


(eth'moyd) [TA]
1. Resembling a sieve.
2. Relating to the ethmoid bone.
Synonym(s): ethmoidal.
[G. ēthmos, sieve, + eidos, resemblance]

ethmoid (ethˑ·moid),

n the very thin bone structure of the nose, through which the ethmoid sinuses and other neural structures pass.
Enlarge picture


1. sievelike; cribriform.
2. the ethmoid bone.

ethmoid bone
the sievelike bone that forms a roof for the nasal fossae and part of the floor of the rostral cranial fossa. See also Table 10.
ethmoid sinus
see concha.
References in periodicals archive ?
8) Nasal obstruction frequently involves the perpendicular plate of the ethmoid bone and the vomer, and it is traditionally treated with an open surgical procedure in which the mucoperiosteum is elevated and the offending bone is fractured and/or removed.
A plow-shaped bone, it articulates with the palatine, maxillary and ethmoid bones, but it is rarely a major concern in the management of facial trauma.
In cases of deep fracture and glabellar depression, the bone often is smashed into tiny pieces, like a crushed egg shell, possibly resulting in additional damage to the ethmoid bone, dura mater and the brain.