Human Muscle Anatomy Diagram - Labeled Upper Body Muscles for Medical Study #3589578 (License: Personal Use)

This vintage-style anatomical engraving depicts a male figure with the left arm raised, exposing the pectoralis major, deltoid, biceps brachii, triceps, rectus abdominis, and external obliques in precise cross-hatching detail. Muscle fibers are rendered with directional shading to indicate origin, insertion, and fiber orientation, and numerical labels (e.g., 38, 40) correspond to a key typically found in original atlases. The pose highlights functional relationships between agonist and antagonist muscle groups during abduction and flexion.

Commonly used in medical textbooks, anatomy courses, and art instruction resources to teach human musculoskeletal structure; serves users seeking visual reference for dissection, clinical diagnosis, or figure drawing. Matches intent for educational, academic, or professional anatomy learning.