Enterocoely

The Enterocoelie is a unique characteristic of deuterostomes and refers to the formation of the mesoderm from a cleavage of the primitive gut, said a trimeric coelom ( Protocoel, Mesocoel, Metacoel ) forms. The formation of the mesoderm and the coelom is happening at the same time.

When enterocoelen development gastrulation begins with the fact that one side of the blastula to the archenteron ( primitive gut ) invaginated. In the course of further invagination of the archenteron with extension of the forming gut tube to push the sides of the Archenterons outward and extended to form a pocket-like Coelomkompartiment. The Coelomkompartiment lace to form an enclosed space of mesoderm surrounding the gut, from. In the resulting cavity, the coelom, fluid accumulates.

In contrast, mesoderm and coelom arise in the Protostomia by Schizocoelie. The mesoderm is it clear from independent cell lines ( Mesodermvorläuferzellen ) which are often composed of a single cell, the so-called 4d cell, arise.