Fixed immovable joint

The fibrous joints are mostly also called as "fixed" or "immovable joints" These types of joints does not have joint cavity and are connected through fibrous connective tissue.

Explanation:

Fixed joints are those where movement of bones is not possible, for example: skull (cranium). They provide stability in certain areas. They are characterized by 'continuity of bony segments' which have been tightly joined and separated by a thin fibrous connective tissue. There are 3 different types of fixed joints: sutures, serrate suture and lap suture.