Think of each of your ribs as being like a bucket handle: on our right side, each rib is attached in our back at a thoracic vertebra, and curves around under our arm and across our chest, where it attaches in the front to our sternum. Ditto each rib on our left side at the matching spinal levels.
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.