Definition: The word "acoelomata" comes from Latin and means "bone". It refers to a group of small, bone-like structures found in some animals, which are known as osteoblasts or osteoblast cells. These cells play an important role in the formation of new bone tissue, particularly in response to injury or inflammation, by releasing calcium and other substances into the surrounding tissues. Osteoblasts can be either endoderm-like or ectodermal-like, depending on whether they differentiate into bone or cartilage. Endodermal osteoblasts are found in the bones, while ectodermal osteoblasts are found in the connective tissue. In some cases, the word "acoelomata" is also used to refer to a group of similar bone-like structures that occur in different animals and can be classified as a single type of bone or an intermediate type. These structures include the osteonecrosis of the tibia (osteocele), which is an abnormal growth of cartilage between two vertebrae, and the osteoclasts, also known as osteoblast cells. Overall, the word "acoelomata" refers to a group of small bone-like structures found in different animal species that are involved in the development and maintenance of bone tissue.

Acoelomata