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The posterolateral boundaries of Sibson fascia are the vertebral column, first rib, levator scapulae muscle, and scalenus medius muscle; the medial boundary is formed by the superior mediastinal structures; and the anterior boundary is formed by the scalenus anterior and sternocleidomastoid muscles.
a) Stretch the upper trapezius and levator scapulae muscles both pre and postflight.