Complete Anatomy of the Muscular System

Description

Posterior anatomy of an adult female torso and shoulder girdle is rendered with the superficial and deep scapulothoracic layers in register. Trapezius spans from the occipital region and nuchal ligament inferiorly toward the thoracic spinous processes, inserting laterally along the acromion and spine of the scapula, while the posterior deltoid caps the lateral shoulder over the glenohumeral joint. Inferior and lateral to the scapular spine, infraspinatus occupies the infraspinous fossa and courses laterally to the greater tubercle of the humerus, and latissimus dorsi sweeps from the lower thoracic region superolaterally toward the intertubercular sulcus. Fiber direction is explicit. Subtle bony landmarks (scapula, posterior ribs, vertebral column, proximal humerus) anchor the muscle attachments. For teaching shoulder mechanics, this posterior view clarifies how scapular position governs rotator cuff function: infraspinatus acts on the humeral head while trapezius controls upward rotation and posterior tilt of the scapula during abduction, and latissimus dorsi counterbalances elevation with extension and internal rotation. It also maps directly to common clinical patterns, such as spinal accessory nerve injury after posterior triangle surgery producing trapezius atrophy and shoulder droop, or scapular dyskinesis contributing to subacromial impingement and secondary rotator cuff tendinopathy. Palpation and injection planning benefit from these surface relationships. A clear landmark set. Use this artwork in myology and gross anatomy modules covering the back and shoulder, in orthopedics or sports medicine texts discussing rotator cuff pathology, scapular winging, and rehabilitation programming, and in patient-facing materials explaining posterior shoulder pain generators and operative approaches near the scapular spine and acromion. Anatomical accuracy verified by SciePro's Medical Advisory Board.