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heart in situ - left ventricle (probe)
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Forward
When the heart is abnormally enlarged or displaced to the left, the apex of the heart may extend past the mammary line. This may be assessed clinically by palpating the PMI (point of maximal impulse).

Pain from a heart attack may be referred to the upper of the sternum, the left 1st-5th intercostals spaces anteriorly, and the medial aspect of the left arm because these areas and the heart are all innervated by T1-T5 spinal cord segments.
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