The principle of minimal work requires that the conducting airways of human lungs should have a maximum radius for minimal resistance to gas flow. Malphigi et al said that the trachea terminated in dilated vesicle. The study of bronchial tree and their dimensions is useful in various aspects as to know the entry of foreign particles, to maintain posture for patients suffering from suppurative lung disorders. For anaesthetist to know the caliber of trachea for intubation, bronchoscopy. Bronchial

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... anatomy is essential knowledge for thoracic surgeons in various surgical maneuvers. Methods: The study of bronchial tree is done in 20 pairs of lungs and the following are observed. Various dimensions like tracheal length, width, sub carinal angle, Length and diameter of principal bronchi from the level of bifurcation of trachea is noted with digital Vernier calipers and scale. Results: Though dimensional analysis of bronchi was studied, it shows no significance from earlier studies. In the present study all the dimensions are within normal limits. Out of 20 pairs 6 specimens showed variations in the branching patterns. Conclusions: The results suggests that there are limited variations in the dimensional study, now a days bronchoscopy procedures are widely used in diagnostic and therapeutic purposes. The sub carinal angle indirectly helps in diagnosis of cardiovascular problems and for surgical resection of segments