How is the ethmoid bulla formed?
It is formed by pneumatization of the bulla lamella and its degree of pneumatization is variable. In its most extreme form (giant ethmoid bulla), it may fill the entire middle meatus. Failure of pneumatization of the ethmoid bulla is termed torus ethmoidalis 3. It usually opens in the retrobullar recess.
Where do the posterior ethmoidal air cells drain?
superior meatus
Ethmoid Sinuses The anterior ethmoid cells drain into the ethmoid infundibulum, in the middle meatus. [22] The posterior ethmoid cells drain into the sphenoethmoidal recess located in the superior meatus.
What is hiatus semilunaris?
The hiatus semilunaris is a semicircular shaped opening located on the lateral wall of the nasal cavity. It is a component of the ostiomeatal complex and serves as the opening for the frontal and maxillary sinuses and the anterior ethmoid air cells.
What is the paranasal sinus?
One of many small hollow spaces in the bones around the nose. Paranasal sinuses are named after the bones that contain them: frontal (the lower forehead), maxillary (cheekbones), ethmoid (beside the upper nose), and sphenoid (behind the nose).
What is Uncinate process of ethmoid bone?
The uncinate process is one of the three downward vertical projections of the ethmoid bone (the other two are the perpendicular plate and the middle turbinate) and articulates inferiorly with the ethmoid process of the inferior turbinate (Figure IB).
What are Ethmoidal cells?
The ethmoid sinuses or ethmoid air cells of the ethmoid bone are one of the four paired paranasal sinuses. The cells are variable in both size and number in the lateral mass of each of the ethmoid bones and cannot be palpated during an extraoral examination. They are divided into anterior and posterior groups.
What are ethmoidal air cells?
Definition. The numerous tiny-walled, fluid-filled cells that lie in the ethmoid bone of the skull (i.e. specifically lying in between the orbits and the upper parts of the nasal cavities), and collectively form the ethmoid sinus. Supplement.
Which structure separates the anterior from the posterior ethmoid air cells?
The basal lamella divides the ethmoid sinus into anterior and posterior air cells.
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