The sternum, or breastbone, is the flat bone where the ribs meet. Sometimes, the joints can pop or crack as a person stretches or moves. A muscle spasm, an injury, costochondritis, and surgery are ...

Well, this visible depression at the top of the sternum between the clavicle is called the suprasternal notch. The trachea or the windpipe lies just behind it and it serves as a landmark in ...