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Apex Medical Definition
Apex - The Latin word for "summit", the apex is the tip of a pyramidal or rounded structure, such as the lung or the heart.
The apex of the lung is indeed its tip - the rounded most superior portion.
Likewise, the apex of the heart is its tip, but it is formed by the left ventricle, so it is essentially the most inferior portion of the heart.
Apex is most commonly used for internal structures (organs).