: In amphibians, the "lip" of the blastopore acts as a primary signaling center that tells surrounding cells whether to become a head, a tail, or a nervous system. How It Forms Blastopore - an overview | ScienceDirect Topics
: It marks the spot where cells move inward to form the primitive gut, known as the archenteron . blastopore
The blastopore is far more than just a hole; it is a fundamental biological landmark that determines the "body plan" of nearly all animals. : In amphibians, the "lip" of the blastopore