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Anatomy of Respiratory System I: Upper Respiratory Tract01:29

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The upper respiratory tract plays a vital role in the respiratory system, comprising several structures that facilitate air intake and prepare air for the lungs. It also serves as the first line of defense against pathogens and particles. This tract includes the nose and nasal cavity, the oral cavity, the paranasal sinuses, and the pharynx, each with specific functions and features.
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The nose is composed of an observable exterior segment (external nose) and an internal segment within the skull known as the nasal cavity (internal nose). The external nose, visible on the face, consists of a framework of bone and hyaline cartilage enveloped in skin and muscle and lined with a mucous membrane. This structure is supported by the frontal bone, nasal bones, and maxillary bone and is supplemented by a cartilaginous framework comprising the septal nasal cartilage, lateral nasal...
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The respiratory system is responsible for the intake of oxygen and the expulsion of carbon dioxide from the body. Respiratory volumes describe the volume of air in the lungs at different phases of the respiratory cycle. Tidal volume is the air breathed in and out during normal, quiet breathing. Inspiratory reserve volume is the air that can be forcefully inspired beyond the tidal volume. In contrast, expiratory reserve volume refers to the air that can be expelled from the lungs after a normal...
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The relationship between structures affecting maxillary sinus ventilation and maxillary sinus volume: a CT study.

Mervenur Güven1, Duygu Akin Saygin2, Ismihan Ilknur Uysal3

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Anatomical variations like septa increase maxillary sinus volume, while nasal septum deviation reduces it. Most individuals have variations, underscoring the need for detailed CT scans in surgical planning.

Keywords:
Accessory ostiumConcha abnormalitiesHaller cellImfusion SuitImpacted toothMaxillary sinus volume

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Area of Science:

  • Anatomy
  • Radiology
  • Medical Imaging

Background:

  • Anatomical variations within and around the maxillary sinus (MS) are common.
  • Understanding these variations is crucial for interpreting sinus pathologies and planning surgical interventions.
  • Previous studies have explored specific variations, but comprehensive analysis of their coexistence and impact on MS volume is needed.

Purpose of the Study:

  • To identify and quantify anatomical variations inside and outside the maxillary sinus (MS).
  • To determine the prevalence and coexistence of these variations in individuals without MS pathology.
  • To investigate the relationship between identified anatomical variations and MS volume.

Main Methods:

  • Analysis of 330 paranasal CT scans using ImFusion Suite software.
  • Identification of variations: accessory ostium, Haller cells, ethmomaxillary sinus, concha anomalies, septa, impacted teeth, and nasal septum deviation (NSD).
  • Measurement of MS volume and NSD angle, followed by statistical analysis to assess relationships with gender and variations.

Main Results:

  • Nasal septum deviation (NSD) was the most frequent variation (98%).
  • MS volume was significantly larger in males than females and increased with septa, but decreased with NSD angle ≥9°.
  • Multiple variations commonly coexisted, with normal anatomy observed in only 2.1% of cases.

Conclusions:

  • Anatomical variations are highly prevalent in the paranasal sinuses.
  • Septa are associated with increased MS volume, while significant NSD (≥9°) correlates with reduced MS volume.
  • Detailed radiological assessment of anatomical variations is essential for effective clinical and surgical management of sinus conditions.