Sternum it is the bone that connects all your rib together
Where Is The Breast Bone On The Human Body?
Center portion of the chest,sister just had operation and this is what they said they had to open her chest bone and the scar is center from upper breast straight down to just before the navel....good luck and hope this helps
It is down the center of your chest from just below the chin to where the bottom-most rib joins it.