The thoracic trapezius is a broad, dorsally oriented muscle that originates along the spinous processes of the thoracic vertebrae and inserts onto the spine and acromion of the scapula. It functions primarily to stabilize the scapula, maintain postural lift of the thoracic region, and coordinate scapulothoracic motion with the trunk. Its fibers run in an oblique orientation, facilitating scapular rotation, retraction, and elevation, which are critical for stride efficiency and dynamic integratio

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