Paranasaalit
Paranasaalit, also known as paranasal sinuses, are a group of air-filled cavities within the bones surrounding the nasal cavity. The four principal sinuses are the maxillary, frontal, ethmoid, and sphenoid sinuses. The ethmoid sinuses consist of a network of small air cells between the nose and the eyes. These cavities are connected to the nasal cavity by small openings called ostia.
Anatomy and drainage: Each sinus is lined by a mucous membrane and communicates with the nasal cavity
Structure and development: The mucous membrane of the paranasaalit is pseudostratified ciliated columnar epithelium with goblet
Function and clinical relevance: The sinuses help reduce skull weight, provide insulation, and contribute to the