Anatomical arrangement of the lobar bronchi, broncho- pulmonary segments and their variations
DOI:
https://doi.org/10.18203/2320-6012.ijrms20163793Keywords:
Bronchial system, Bronchopulmonary segments, Bronchopulmonary variationsAbstract
Background: The segmental concept of lungs was still in dispute in the literature. Although the segments differ considerably in shape and size, they all contain a well-defined area of lung and they are all well demarcated from the neighbouring segments. Therefore, in the present study, an attempt has been made to demonstrate the anatomical arrangement of the lobar bronchi, broncho-pulmonary segments and their variations.
Methods: The study was conducted in fifty human lungs, obtained from autopsies, dissection hall cadavers and full term foetuses. The bronchial tree was investigated by air inflation, dye injection and using dissection, preparation of casts, air inflation, dye injection and bronchographic techniques. The external morphology of lungs and their lobes has been studied and the bronchopulmonary segments are described in detail.
Results: In humans, the right lung is found to consist of ten segments in only 77% cases, and the left lung of ten segments in 84% cases. Thus in the study of 50 human lungs, the classical textbook description has occurred only in 80.5% of cases. Remaining 19.5% showed variations. Among the variations observed, right lung showed (59%) predominance over (41%) on left side.
Conclusions: In man there is an increase in the number of bronchial generations and alveoli after birth. An increase in their size was noted as well. Thus the study of variations in the pattern of bronchopulmonary segments aids the clinician very much. It is necessary for Thoracic Surgeons, Anaesthetists, Chest physicians, Radiologists, Ultrasonologists, Pathologists and Anatomists for investigative procedures, diagnosis and various treatment modalities including surgeries like segmentectomy.
References
Ralph A, Davenport LF. The Technique of bronchography and a system of bronchial nomenclature. JAMA. 1942;118:111-6.
Churchill ED. Segmental and lobular physiology and pathology of lung. Journ. Thorac. Surg. 1994;18:279-93.
Ameil G. The bronchopulmonary segment with special reference to putrid lung abscess Am.J.Roentgenol. 1998;31:328-32.
Neil JH, Gilmour W, Gwynne FJ. The broncholpulmonary segments- radiological, pathological and bronchoscopic considerations; with special reference to the subapical bronchopulmonary segement. Med J Austrailia. 1973;2:165-72.
Peirce, Carleton B, Bruce W. Stocking. The roentgenological anatomy of the chest II. The bronchial distribution. Am. Res. Tuberc. 1993;39:516-27.
Pryce DM, Sellors TH, Blair LG. Intra lobar sequestration of lung associated with an abnormal pulmonary artery. Brit. J. Surg. 1974;35(18):29.
Cairney J. The lobe of the azygos vein: Note on two additional cases. ; J. anat. 1998;58:54-8.
Abey, Narath, Ewart and Willaim. The bronchi and pulmonary vessels: Their anatomy and nomenclature: With a criticism of Professor Aeby’s views on the bronchial tree of mammalia and of man. Disec Chest. 1998;11:511-64.
Crawford D. Tomography with special reference to its value in the diagnosis of pulmonary lesions. Am. Rev. Tomography. 1997;36:163.
Grethmann W. Architecture of Terminal Bronchi of Human Lung. Amer.Rev. Tuberc. 1998;31(3):261-98.
Hare WCD. The bronchopulmonary segments in sheep. J.Anat. 1976;89:387-401.
Haywood J, Lyune R. Observations on the anatomy of the intrasegmental bronchial tree. Thorax. 1952;7:97-8.
Ishaq MA. Morphological study of the lung and bronchial tree of the dog with a suggested system of nomenclature for bronchi. J.Anat. 1980;131(4):589-610.
Medlar EM. Variations in interlobar fissures. Am. J. Roentgenol. Radium. Ther. 1947;57(6):723-5.
Ferenc Kovats Jr. Zoltan- Zsebok. The Thorax. A Radiographical and Anatomical Atlas. American Review of Respiratory Disease. 1961.
Scannel B. An analysis of variations in the bronchial tree and lungs with a system of nomenclaute. Dis. of Chest. 1955;9:319-26.
Campbell AH, Liddelow AG. Significant variations in shape of tachea and large bronchi. Med. J. 1997;54:1017-20.
