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Direct current (DC) refers to an electric current that flows in a single direction, maintaining a constant polarity. This is in contrast to alternating current (AC), which periodically changes its direction and magnitude. AC forms the backbone of modern electricity transmission and distribution systems due to its efficient long-distance transmission capabilities.
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Updated: Mar 18, 2026

Establishment of a Rat Model of Superior Sagittal-Sinus Occlusion via a Thread-Embolism Method
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Sinusology.

R Jankowski1, D T Nguyen1, M Poussel2

  • 1Service ORL et chirurgie cervico-faciale, hôpital de Brabois, centre hospitalier régional universitaire de Nancy, université de Lorraine, bâtiment Louis-Mathieu, 54500 Vandœuvre-lès-Nancy, France.

European Annals of Otorhinolaryngology, Head and Neck Diseases
|July 6, 2016
PubMed
Summary
This summary is machine-generated.

Sinusology, the study of paranasal sinuses, is based on nitric oxide (NO) production and evo-devo theory. Sinus NO acts as an aerocrine messenger, potentially aiding oxygen transport and respiratory function.

Keywords:
Evo-devoHistoryNitric oxide (NO)Paranasal sinusesPhysiology

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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.