Lungs of an Obese Male

Description

Centered in the lower neck, the trachea descends in the midline with its C-shaped cartilaginous rings, then bifurcates at the carina into the right and left main bronchi. The right lung lies lateral to the mediastinum and is divided into superior, middle, and inferior lobes, with the oblique fissure running inferoanteriorly toward the diaphragm and the horizontal fissure separating the upper and middle lobes. On the left, the superior and inferior lobes are separated by a single oblique fissure, and the medial anterior border approximates the cardiac notch. Inferiorly, both lungs rest on the domes of the diaphragm, with the bases projecting more caudally in the midaxillary line than at the sternum. Superimposing the respiratory anatomy on an obese adult male chest adds context that standard isolated lung plates omit: increased subcutaneous tissue can obscure surface landmarks, and the elevated intraabdominal pressure commonly associated with obesity reduces functional residual capacity by limiting diaphragmatic excursion. This is the setup for obesity hypoventilation syndrome and perioperative atelectasis, and it also helps explain why basal crackles and dependent opacities on chest radiography often localize to the posterior inferior lobes when ventilation is shallow. The fissure lines matter. They guide lobe-based localization of pneumonia, aspiration (classically right lower lobe), and surgical planning for lobectomy or segmental resection. Use this artwork in gross anatomy and respiratory physiology teaching to link tracheobronchial branching to lobar anatomy and diaphragmatic mechanics, and in clinical education materials on obesity-related dyspnea, postoperative pulmonary complications, and airway management. It also fits thoracic surgery and radiology publications that need a clear lobe and fissure reference without losing the patient-facing body orientation. Anatomical accuracy verified by SciePro's Medical Advisory Board.