What does the ethmoid bulla drain?
What does the ethmoid bulla drain?
The ethmoid bulla is the largest air cell of anterior ethmoid sinus. It extends from the lamina papyracea laterally and bulges medially into the middle meatus. The ostium of the ethmoid bulla often located on the upper margin of the posterior wall and drains into the middle meatus.
What forms the ethmoid bulla?
The ethmoid bulla (or ethmoidal bulla) is an elevation on the lateral wall of the middle meatus of the nose. It is produced by middle ethmoidal cells. It develops during the first trimester of gestation, and varies significantly based on the size of air cells.
What is a bulla in anatomy?
Bulla: A fluid-filled blister more than 5 mm (about 3/16 inch) in diameter with thin walls. A bulla on the skin is a blister. A bulla on the pleura (the membrane covering the lung) is also called a bleb.
What is anterior ethmoid air cells?
The ethmoidal air cells (also ethmoidal sinuses or ethmoid sinuses, latin: cellulae ethmoidales) are multiple thin walled cavities located within the ethmoidal labyrinth. The anterior ethmoidal air cells drain into the middle nasal meatus of the nasal cavity via the ethmoidal infundibulum or the frontonasal duct.
What is a ethmoid bulla?
The ethmoid bulla is the largest anterior ethmoid air cell. It is also one of the most consistent air cells in the middle meatus and is therefore a reliable anatomic landmark (Fig. 2.13). It often lacks a posterior wall, which is why it is not called a cell but rather a bony lamella with a large airspace behind it.
What is the uncinate process of the nose?
The uncinate process is a wing or boomerang shaped piece of bone. It forms the first layer or lamella of the middle meatus. It attaches anteriorly to the posterior edge of the lacrimal bone, and inferiorly to the superior edge of the inferior turbinate.
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 is the definition of a bulla?
Overview. A bulla is a fluid-filled sac or lesion that appears when fluid is trapped under a thin layer of your skin. It’s a type of blister. Bullae (pronounced as “bully”) is the plural word for bulla. To be classified as a bulla, the blister must be larger than 0.5 centimeters (5 millimeters) in diameter.
What are ethmoid air cells for?
The ethmoid (ETH-moyd) bone is that part of the skull in between the orbits and separates the nasal cavity from the brain. The function of the ethmoid air cells may be associated with the warming, humidifying, and filtering of inhaled air.
Where does ethmoid sinus drain?
The ethmoid sinuses are within the ethmoid bone and are divided into two compartments, the anterior and posterior. The anterior ethmoid sinus drains into the middle meatus, and the posterior ethmoids drain into the sphenoethmoidal recess.
What is Uncinate spurring?
Upon separation of the vertebral bodies, upon the upper surfaces of their posterolateral aspects, convex spur-like ridges, consisting of spongy bone and covered by cartilage, are the uncinate process. On the corresponding undersurface of the vertebral body are concave areas, also covered by cartilage.
