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Definition of Apex

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'its rounded most superior portion. The apex of the heart is likewise its tip, but it is formed by the left ventricle, so it is essentially the most inferior portion of the heart.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=2301
Last Editorial Review: 3/19/2012

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