ethmoid cells


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eth·moid cells

ethmoidal air cells; evaginations of the mucous membrane of the middle and superior meatus of the nasal cavity into the ethmoidal labyrinth forming multiple small paranasal sinuses; they are subdivided into anterior, middle and posterior ethmoidal sinuses. See: anterior ethmoidal cells, middle ethmoidal cells, posterior ethmoidal cells.

ethmoid cells

paranasal sinuses occurring in groups within the ethmoid bone and communicating with the ethmoidal infundibulum and bulla and the superior and highest meatus. They are often subdivided into anterior, middle, and posterior ethmoid cells, groups of air cells named according to where they open into the nasal meatus. Also called ethmoid sinuses. Compare frontal sinus, maxillary sinus, sphenoidal sinus.

eth·moid cells

(ethmoyd selz)
Evaginations of the mucous membrane of the middle and superior meatus of the nasal cavity into the ethmoidal labyrinth forming multiple small paranasal sinuses.

eth·moid cells

(ethmoyd selz)
Ethmoidal air cells; evaginations of mucous membrane of middle and superior meatus of nasal cavity into ethmoidal labyrinth forming multiple small paranasal sinuses; subdivided into anterior, middle and posterior ethmoidal sinuses.
See: anterior ethmoidal cells
Synonym(s): ethmoidal sinuses.
References in periodicals archive ?
Type 2 frontal recess cell (Fig 2): They are defined as a tier of two or more anterior ethmoid cells sitting above the agger nasi cell (9,10).
Onodi cells (FIG 10) are ethmoid cells that have migrated to the anterior region of the sphenoid sinus, with anterosuperior location, and intimately related to the optic nerve, causing optic neuropathy in case of certain conditions that affect such cells (27).
The anterior and posterior ethmoid cells are defined by and separated by the basal lamella of the middle turbinate.
We performed a right uncinectomy, removed the anterior ethmoid cells, and perforated the ground lamella in order to approach the posterior ethmoids, which were filled with the soft, smooth mass.
The most anterior of the ethmoid cells, the agger nasi cell is also the first to pneumatize in the newborn, and it is quite prominent throughout childhood.
Dissection of the left posterior ethmoid cells revealed the presence of a superior Onodi cell (sphenoethmoid cell) above the sphenoid sinus (figure, B).
The anterior ethmoid artery, a branch of the ophthalmic artery, leaves the orbit via the anterior ethmoid foramen, crosses the roof of the anterior ethmoid sinus, and supplies the anterior ethmoid cells and frontal sinus (figure, A).
We initiated the procedure by resecting the uncinate process and opening the ethmoid cells and sphenoid sinus in the usual manner for endoscopic ethmoidectomy.
The anterior ethmoid cells drain into the middle meatus--of ten through the hiatus semilunaris superior, but sometimes through the anterior or lateral bulla wall, the ethmoid infundibulum, the hiatus semilunaris inferior, or the retrobullar recess.