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Address for Correspondence: Dr. Neil James, Post-graduate student, Department of Anatomy, Sree Mookambika Institute of Medical Sciences, Kulasekharam – 629161, Tamil Nadu, India. E-Mail: neiljames.e@gmail.com Introduction: The organs of respiration, a pair of lungs, are present in the thorax one in each side of the mediastinum. The right lung has two fissures – oblique and horizontal, and the left lung has a single oblique fissure. The division of the lung into different lobes by the fissures helps in the relative movement of the lobes with respect to one another, thereby contributing to the uniform expansion of the lung. Variations are seen in the number and pattern of fissures, as well as the number and arrangement of hilar structures. Knowledge of the normal morphology of the lung as well as the common variations are essential prerequisites for radiologists, pulmonologists and surgeons. Materials and methods: The variations in the number of fissures, lobes, and arrangement of hilar structures were studied in the right and left lungs of 25 formalin fixed cadavers at Sree Mookambika Institute of Medical Sciences, Kulasekharam. Results: Left lungs one lung (4%) had two fissures and three lobes. Hilar structures were normal in number and arrangement. Right lungs Number and pattern of fissures and lobes were normal in all the specimens. Six lungs (24%) had variations in hilar structures with 4 (16%) of them having a single bronchus, two lungs (8%) having three pulmonary veins and one lung (4%) having the atypical arrangement of hilar structures in which the bronchus and pulmonary artery at the same level. Conclusion: Prior anatomical knowledge and possible variations in the number of fissures, lobes, and arrangement of hilar structures, which may be regionally different and are essential prerequisites for clinicians, radiologists and surgeons.

MORPHOLOGICAL STUDY OF LOBES, FISSURES AND PULMONARY HILAR STRUCTURES