Derived from the mesoderm, the coelom is found between the intestinal canal and the body wall, lined with mesodermal epithelium. The mesodermal tissue also goes on to form the blood, bones, digestive tract, gonads, kidneys, and other organs. Organisms that possess a true coelom are called (true) coelomates.

How is coelom formed?

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.

Is coelom present in between mesoderm and endoderm?

Coelom is a fluid-filled cavity that forms the main body cavity of vertebrate and most invertebrate animals. It is found between mesoderm and body wall (endoderm).