the inner costal are the muscles between the ribs that help spread and close them as you breath also the diaphram and rectus abdominals aid the rib cage
Diaphram, the one that causes hiccups :P
muscular system
Diaphragm
The diaphragm - a sheet of muscle across the rib-cage just under the lungs.
Feeling a tugging sensation under your rib cage can be a sign of Lyme disease. It could also be something minor like a muscle spasm.
PAIN UNDER RIB CAGE UPPER LEFT SIDE WITH SPASMS. VERY PAINFUL HARD TO GET UP AFTER LAYING down.
sharp intense pain on left side of lower rib
It is called the Diaphragm, which is under the lungs and rib cage. ---- The Diaphragm is what moves the rib cage up and down when you breath in and out.
Your immune system and your rib cage, plus a layer of muscle
The lungs and heart are found within the rib cage. The rib cage provides protection for these vital organs.
Growing Pains perhaps depending upon your age.
While rib cage pain can be caused by a broken or fractured rib there could be several other causes as well including inflammation of the cartilage near the breastbone, pleurisy, muscle spasms, and osteoporosis. Only a doctor can tell you for sure what if causing your particular rib cage pain.
Your solar plexus?
Pain under the rib cage is usually a cramp from exercising. If the pain does not subside, you may need to visit a doctor.