Dr. Somali Nguyen demonstrates how to perform a musculoskeletal ultrasound using a high-frequency linear probe to assess superficial structures like muscles for signs of tears or abscesses. Focusing on the patient’s left bicep, he explains how to capture both long and short axis views, observe muscle striations and fascicles, and assess muscle contraction during movement. The lecture emphasizes proper probe orientation, patient positioning, and scanning technique to ensure a complete and accurate evaluation of the muscle.