AbstractIntroduction: In the light of increase in incidence of pulmonary diseases, there is a concomitant increase in study of lungs and bronchial tree morphologically and clinically. The knowledge of this study is of immense value in endoscopic procedures for diagnostic and therapeutic purposes. The lungs are the essential organs of respiration which are divided into lobes by fissures. The fissures facilitate the movement of the lobes and help in a more uniform expansion of the whole lung. These fissures may be complete, incomplete or absent. In addition to these fissures, lung might also have accessory fissures, usually indicating the junction between bronchopulmonary segments. Knowledge of fissures is necessary for the appreciation of lobar anatomy and thus for locating the bronchopulmonary segments which are significant both anatomically and clinically. Aims and objectives: To study morphological variations in relation to fissures and lobes of lung and calculating percentage and comparing it with the previous studies to conclude incidence of occurance of variations bilaterally among coastal south Indians. Materials & Methods: we have studied 77 lungs obtained from embalmed cadavers by dissection method according to standard method described in Cunningham’s Practical manual. Results: Out of total 37 right lungs, 9 showed absences of horizontal fissure, 9 showed incomplete horizontal fissure and 19 lungs showed complete both horizontal and oblique fissures. Out of total 40 left lungs, 30 lungs showed complete oblique fissure and 10 showed incomplete oblique fissures. No Accessory fissure was seen bilaterally. Conclusions: Awareness of the variations in the lobes and fissures of the lungs is important for radiologists for proper radiological interpretation and to clinicians for performing segmental lung resections, lobectomies and endoscopic procedures.