What does ethmoid infundibulum mean?
The ethmoid infundibulum is a curved cleft of the ethmoid bone which leads into the anterior portion of the hiatus semilunaris. It is bordered medially by the uncinate process and laterally by the orbital plate of the ethmoid.
What is the semilunar hiatus?
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 maxillary hiatus?
The maxillary ostium or maxillary hiatus is an opening that forms the drainage channel of the maxillary sinus and is also one of the components of the ostiomeatal unit. It is located posteriorly and medially near the roof of the maxillary sinus measuring approximately 2-4 mm.
Is the semilunar hiatus part of the middle meatus?
Notice the semilunar hiatus in the middle meatus and the ethmoid bulla above it. The anterior ethmoidal air cells drain into the hiatus. The hiatus is also connected to the frontal sinus by the frontonasal duct. The maxillary sinus also drains into the semilunar hiatus here, posteriorly.
Which sinus drains into the semilunar hiatus?
maxillary sinus
The semilunar hiatus is the gap that empties the ethmoid infundibulum located between the uncinate process and the ethmoid bulla. The nasal fontanelles are described as an area of the lateral nasal wall where no bone exists. The natural ostium of the maxillary sinus is located in the anterior fontanelle.
How maxillary hiatus is closed?
In the fresh state, usually only one small opening exists, near the upper part of the cavity; the other is closed by mucous membrane.
Where is the hiatus bone?
Anatomical Parts The hiatus semilunaris (or semilunar hiatus) is a crescent-shaped groove in the lateral wall of the nasal cavity just inferior to the ethmoidal bulla. It is the location of the openings for the frontal sinus, maxillary sinus, and anterior ethmoidal sinus.
What is a maxillary sinus?
Listen to pronunciation. (MAK-sih-LAYR-ee SY-nus) A type of paranasal sinus (a hollow space in the bones around the nose). There are two large maxillary sinuses, one in each of the maxillary bones, which are in the cheek area next to the nose.
What is the function of the ethmoid infundibulum?
The ethmoid infundibulum is a pyramidal space that facilitates the drainage of the maxillary, anterior ethmoid, and frontal sinuses.[4] The superior attachment of the uncinate process determines the spatial relationship of the frontal sinus drainage.
What is the 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 are the lamellae of the ethmoidal labyrinth?
The complex ethmoidal labyrinth can be reduced into a series of lamellae based on embryologic precursors. These lamellae are obliquely oriented and lie parallel to each other. The first lamella is the uncinate process. The second lamella corresponds to the ethmoid bulla.
How can the complex ethmoidal labyrinth be reduced to a series?
The complex ethmoidal labyrinth can be reduced into a series of lamellae based on embryologic precursors. These lamellae are obliquely oriented and lie parallel to each other. The first lamella is the uncinate process.