With inhalations, our chest expands. With deeper breaths, the ribs move up / out from their front & back attachments, in the same way that a bucket handle moves from its attachments on either side of a bucket.
An impact on a rib in the back can affect its attachment in the front of the body, and vice versa. Impacts on side(s) of rib(s) can disturb their attachment(s) in front and / or back. Careful assessment of the rib cage is part of my full-body balancing with Activator Chiropractic.