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What is in the image: the image shows two anatomical diagrams focusing on the back muscles, particularly how they engage when the arm is raised. the diagrams are simplified, using color blocks to represent muscle groups rather than detailed anatomical rendering. japanese text accompanies the diagrams, explaining the movement and muscle engagement.

WDTagged Character:

WDTagged Tags: monochrome, bald, white background, simple background, 1boy, male focus, profile, upper body, cropped torso, multiple views, from behind, clothing cutout, closed mouth, long hair, back