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Angle α (occipital–C2) is formed by McGregor line and the inferior end plate of the axis; angle β (C2–C7), by the inferior end plate of C2 and inferior end plate of C7; angle γ (C7–sternal), by the inferior end plate of C7 and the anterior border of sternum; angle δ (sternal slope), by the anterior border of sternum and the horizontal line.
