ethmoid sinus

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Related to Ethmoidal cells: ethmoid air cell

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 ?
Onodi Cell: This is a posterolateral pneumatization of posterior ethmoidal cell coming into intimate relationship with optic nerve.
During the age of 2 to 6 years anterior ethmoidal cells migrate to frontal bone and become frontal (fronto-ethmoidal) cells.
Trauma to the middle turbinate, accidental entry into anterior ethmoidal cells and difficulty in making a bone window are the complications encountered and managed intra operatively by a single surgeon.
Occasionally the anterior ethmoidal cells were opened accidentally and further damage was avoided by restricting surgery limited to the lacrimal sac region.
9) have defined the osteomeatal complex as a complex including the maxillary sinus ostium, ethmoid infundibulum and middle meatus; in other words, as the final site of drainage from the frontal and maxillary sinuses and anterior ethmoidal cells.
Agger nasi cells, the most constant ethmoidal air cells, lie below the frontal sinus, inferolateral to the lacrimal sinus, and represent pneumatization of the lacrimal bone by extension of the anterior ethmoidal cells (12).