Starting at your..: Breast (which is an organ), there is muscle (pectoralis) then ribs, then lung on both sides. Under your left breast would normally be a portion of your heart. There is also muscle tissue between the ribs.
Answered 8/7/2017
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6 doctors weighed in across 2 answers
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6 doctors weighed in across 2 answers
A doctor has provided 1 answer
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