Deuterostomes differ in that their coelom forms through a process called enterocoely, when the mesoderm develops as pouches that are pinched off from the endoderm tissue. These pouches eventually fuse to form the mesoderm, which then gives rise to the coelom.

How does a coelom develop?

Protostomes form a coelom by the use of a 'blind pouch' that appears when the organism's digestive tract is beginning to develop. It occurs when the mesoderm, or middle layer of the three basic layers of tissue, begins to split, which develops into the coelom.

What is coelomic compartment?

IN THE ADULT, THE INTRAEMBRYONIC COELOM is divided into 3 well-defined compartments. A pericardial cavity containing the heart. The pleural cavities containing the lungs. The peritoneal cavity with the viscera, caudal to the diaphragm.