The jelly-like sticky extracellular layer between the epidermis and gastrodermis of Nidaria is called mesoglia. It is thin, colorless and elastic. Its diameter is 0.1 micron. Dr. Siddiq Publications
Function of mesoglia
1. Mesoglia serve as the foundation of the epidermis and endoderm.
2. It acts as an attachment point.
3. It makes the body contract and expand.
4. Acts as a flexible skeleton of the body.
5. It contains myofibrils.