paranasaalisiin

Paranasaalisiin refers to the paranasal sinuses, which are air-filled cavities located within the bones of the skull, surrounding the nasal cavity. These sinuses are lined with mucous membranes and are connected to the nasal cavity by small openings called ostia. The primary function of the paranasal sinuses is not fully understood, but it is believed they lighten the weight of the skull, contribute to voice resonance, and help warm and humidify inhaled air.

There are four main pairs of paranasal sinuses: the frontal sinuses located in the forehead, the maxillary sinuses in the cheekbones, the ethmoid sinuses situated between the eyes, and the sphenoid sinuses deep within the skull behind the eyes. These sinuses develop and grow throughout a person's life, with full development typically occurring in adulthood.

Inflammation or infection of the paranasal sinuses is known as sinusitis. This condition can cause symptoms such as facial pain, pressure, nasal congestion, and a reduced sense of smell. Sinusitis can be acute, lasting for a short period, or chronic, persisting for longer durations. Various factors can contribute to sinusitis, including viral or bacterial infections, allergies, and structural abnormalities within the nasal passages.