A STUDY ON THE PATTERNS AND VARIATIONS IN THE TERTIARY BRONCHI OF RIGHT LOWER LOBE OF HUMAN LUNG
Journal Title: Journal of Evolution of Medical and Dental Sciences - Year 2017, Vol 6, Issue 50
Abstract
BACKGROUND Ten bronchopulmonary segments are described for each lung. Foreign bodies and other aspirated materials tend to enter the right instead of the left bronchus, because the former is wider and more in continuation with the trachea and from there to the apical bronchus of the lower lobe. So the right lower lobe was selected for a study by dissection. The bronchopulmonary segments of inferior lobe of right lung are 5 in number- superior (apical), medial basal, anterior basal, lateral basal and posterior basal. Some workers consider an occasional segment, which arises as a separate bronchus from the right inferior lobar bronchus below the apical bronchus, which they term as subapical segment. MATERIALS AND METHODS 56 human cadaveric right lungs from the Department of Anatomy, Government T. D. Medical College, Alappuzha, Kerala, were dissected to visualise the bronchial tree. The lower lobar bronchus was identified to study its branching pattern to tertiary bronchi. The external length and diameter of the tertiary bronchi were measured using digital vernier calipers. RESULTS Apical (B6), Lateral basal (B9) and Posterior basal (B10) segments were constantly present, whereas Medial basal (B7) and Anterior basal (B8) were seen in 89.3% and 96.4% respectively. A Subapical segment (B*) was seen in 17.9%. Out of the studied bronchopulmonary segments, B6 had the maximum average external breadth (5.5 mm) and B9 the maximum average length (1 mm). CONCLUSION The tertiary bronchi may be of different patterns due to developmental variations. A thorough knowledge about the anatomic principles of bronchial branching and use of a lobe-based classification scheme will help in the recognition of tracheobronchial positional anomalies before performing diagnostic or therapeutic bronchoscopic procedures.
Authors and Affiliations
Rani Raphael M, Rajad R
Keywords
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- EP ID EP219652
- DOI 10.14260/Jemds/2017/829
- Views 64
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