Sinusology.

Area of Science:

• Anatomy
• Physiology
• Pathophysiology
• Sinusology
• Rhinology

Background:

• The study reviews historical anatomical, physiological, and pathophysiological concepts of paranasal sinuses.
• Sinusology is founded on nitric oxide (NO) production and evolutionary developmental (evo-devo) theories of sinus formation.
• Paranasal sinuses develop from bone marrow cavities that fill with gas, releasing it into nasal passages via the ostium.

Observation:

• The sinus epithelium continuously synthesizes nitric oxide (NO).
• Paranasal sinus cavities act as reservoirs for NO, released in bursts when the ostium opens.
• Ostium opening can be triggered by sound vibrations, including humming or external acoustic stimuli.

Findings:

• Nitric oxide (NO) functions as an aerocrine messenger between upper and lower respiratory tracts.
• NO release reduces pulmonary vascular resistance and enhances alveolar oxygen transfer.
• Physiological roles of NO may involve speech, singing, and snoring, impacting arterial blood oxygenation.

Implications:

• Sinusology provides a scientific basis for understanding the respiratory and olfactory roles of the nose, as defined by the evo-devo concept in rhinology.
• The findings suggest novel physiological functions for paranasal sinuses related to respiratory and cardiovascular health.
• Further research into NO's role could lead to new therapeutic strategies for respiratory and circulatory conditions.