Medical 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.
Quick GuideStages of Pregnancy: 1st, 2nd, 3rd Trimester Images
Subscribe to MedicineNet's Pregnancy & Newborns Newsletter