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Definition of Vertex

Vertex: The top of the head. In a vertex presentation, the top of the baby's head comes first at delivery. The word "vertex" in Latin means a "whirlpool, whirlwind, top of the mountain, or the top of the head." Why "top of the head"? Because the hairs on the top of the head often form a whorl, a whirl-like pattern.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=5987
Last Editorial Review: 3/26/1998 2:29:00 PM

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