Where is the basal lamella?
The basal lamella, also known as basal lamella of the middle turbinate, is an osseous lamella that separates the anterior from the posterior ethmoid sinuses 1.
What are the 4 sinuses?
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 three groups are sinuses divided into?
Picture of the sinuses Ethmoid sinuses: The ethmoid sinuses are located in the ethmoid bone, which separates the nasal cavity from the brain. These sinuses aren’t single sacs but a collection of 6 to 12 small air cells that open independently into the nasal cavity. They’re divided into front, middle, and rear groups.
What is the function of the ethmoid?
The primary function of the ethmoid sinus, like all the sinus cavities in the skull, is to provide lubrication (mucus) to the inner nose. In addition to creating mucus, the sinuses — including the ethmoid sinus — reduce the skull’s overall weight and make one’s voice more resonant as they grow in size during puberty.
Where do sphenoid sinuses drain?
The posterior ethmoid and sphenoid sinuses drain into the superior meatus below the superior turbinate. The ostia of the maxillary, anterior ethmoid, and frontal sinuses share a common site of drainage within the middle meatus.
What is paradoxical middle turbinate?
Paradoxical middle turbinate is a rare developmental cause of nasal obstruction. It refers to an inferomedially curved middle turbinate edge with the concave surface facing the nasal septum and usually occurs bilaterally.
What is the purpose of paranasal sinuses?
They are centered on the nasal cavity and have various functions, including lightening the weight of the head, humidifying and heating inhaled air, increasing the resonance of speech, and serving as a crumple zone to protect vital structures in the event of facial trauma.
Where does maxillary sinus drain?
The maxillary sinus drains into the nose through a hole called the ostia. When the ostia becomes clogged, sinusitis can occur. The ostia of the maxillary sinus often clog because the ostia are located near the top of the maxillary sinus, thus making proper drainage difficult.