up to which area of the chest is considered breast tissue? The teardrop curve which goes down at the side of the breastbone (sternum) and the part above it on either side, is that part of the breast?
im confused ?
You might want to google “anatomy of breast” which should bring up drawings of the different parts of the breast. Breast tissue is made up of lobes and ducts. The ducts go into the nipple. The lobes make the milk. Some of the breast tissue goes into the armpit, and up to the collarbone so it is quite extensive. The breast sits on top of the pectoral muscle.
I hope that helps a bit.
Seagulls