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.