Dr. Somali Nguyen demonstrates a basic pulmonary ultrasound using a high-frequency linear probe to visualize superficial structures, specifically the pleural space. He explains proper probe orientation for both sagittal and transverse views, positioning it at the second or third intercostal space along the mid-clavicular line. The lecture emphasizes identifying the pleural line between ribs and adjusting the probe to capture clear images, offering a practical introduction to pulmonary imaging within a broader comprehensive assessment.