ethmoid sinus

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Related to Ethmoidal air cells: ethmoidal sinuses

ethmoid sinus

An air cavity or space within the ethmoid bone, opening into the nasal cavity.

ethmoid sinus

Any of the 3-18 paranasal sinuses on each side of the skull in and adjacent to the ethmoid bone. The ethmoid sinuses can be categorized as anterior, middle, or posterior, with each group usually draining into a different part of the nasal cavity. Ethmoid sinuses have very thin walls and are interconnected via openings in the septa between the sinuses.
See also: sinus

ethmoid sinus,

n one of the facial cavities, located beneath the nasal bridge, through which air flows.


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 ?
33% of the patients in endonasal group had accidental entry into ethmoidal air cells and trauma to the middle turbinate during the surgery.
The investigation of the structures in the ethmoidal air cells on CT.
However, OMC is often referred to the area encompassed by: (a) The ostium of maxillary sinus, the ostia of anterior ethmoidal air cells, the frontonasal duct (frontal recess), the ethmoidal infundibulum, and the middle meatus and (b) The sphenoethmoidal recess and the superior meatus (7).
When this plate becomes pneumatized by extension of the anterior (55%) or posterior (45%) ethmoidal air cells, the air cell created is referred to as concha bullosa (11) (Figures 1 and 2).
Ethmoidal Variations: Haller cells-According to Kennedy and Zinreich (17), Haller cells, ethmoidal air cells that project inferiorly to the ethmoidal bulla into the floor of the orbit in the region of the maxillary sinus ostium, are encountered in 10% of the population (Figure 5).