The half arm-span is the distance from the midline at the _______ to the tip of the middle finger while the non-dominant arm is stretched out in a horizontal position.

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The sternal notch is the indentation at the top of the sternum and is commonly used as a landmark in anatomy. The half arm-span distance is measured from the midline at the sternal notch to the tip of the middle finger, while the non-dominant arm is stretched horizontally.

The Half Arm-Span Is the Distance from the Midline at the _______