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Definition of Delivery, vertex

Delivery, vertex: In a vertex delivery, the top of the baby's head comes first. The vertex here refers to the top of the head. 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.medicinenet.com/script/main/art.asp?articlekey=2939
Last Editorial Review: 8/28/2013

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