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Definition of Presentation, vertex

Presentation, vertex: In a vertex presentation, the top of the baby's head comes first at delivery. The vertex here refers specifically to the top of the head The word "vertex" in Latin means a "whirlpool, whirlwind." 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.medicinenet.com/script/main/art.asp?articlekey=5037
Last Editorial Review: 10/30/2013

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