This document provides an overview of musculoskeletal ultrasound of the shoulder at the basic level. It describes the anatomy of the shoulder joint and rotator cuff muscles. It provides guidance on patient positioning and ultrasound probe placement to visualize various structures like the biceps tendon, subscapularis tendon, supraspinatus tendon, infraspinatus tendon, and acromioclavicular joint in both longitudinal and transverse views. It also discusses potential abnormalities that can be identified like tendinosis, tears, bursitis, and osteoarthritis.