Arm Abduction Anatomy Diagram - Humerus and Scapula Motion #1404557 (License: Personal Use)

The left panel shows the resting position of the arm with the humerus articulating at the scapula, while the right panel depicts active abduction, indicating a 20° initial movement and full 90° elevation. Red arrows denote direction of motion, and labeled bones and joints clarify biomechanical relationships essential for understanding shoulder kinematics.

Used in anatomy education, physical therapy guides, and orthopedic reference materials to teach or reinforce concepts of shoulder joint mobility and musculoskeletal function; matches user intent for learning or reviewing abduction mechanics.