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
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References in periodicals archive ?
KEY: Anterior (A); Posterior (P); Superior (S); Inferior (I); Intersinus Septum (IS); Intrasinus Septum/ Septa (IntrS/Sa); Posterior Ethmoidal Cell (PEC); Internal Carotid Artery (ICA); Maxillary Nerve (MN); Vidian Nerve (VN); Clivus (C); Sella Turcica (ST)
In the simplest case, the patient can have only one AN cell without the frontal ethmoidal cells.
In adults, the depth, width, and borders of the frontal recess depend on the anterior ethmoidal cells and embryological pneumatization pattern of the neighboring bone structures (5,9).
This mass is infiltrating the left nasal cavity, ethmoidal cells, and cribriform plate, causing erosion to the plate.
This is a posterolateral pneumatization of posterior ethmoidal cell coming into intimate relationship with optic nerve.
Supraorbital ethmoidal cells: The ethmoid air cells can extend supraorbitally and is said to be present in 15% to 21% according to Bhatt NJ.
Onodi Cell: This is a posterolateral pneumatization of posterior ethmoidal cell coming into intimate relationship with optic nerve.
Trauma to the middle turbinate was seen in 5 cases while in 4 cases there was accidental entry into anterior ethmoidal cells. In 8 cases there was difficulty in making a bone window.
Occasionally the anterior ethmoidal cells were opened accidentally and further damage was avoided by restricting surgery limited to the lacrimal sac region.
Agger nasi 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).