A totally rigid immovable joint resulting from fusion of bones is known as what?

A totally rigid immovable joint resulting from the fusion of bones is known as synostosis. This type of joint formation occurs when two bones, which may initially be separate, grow together to form a single unit. Synostosis is commonly seen in specific areas of the body, such as the bones of the skull, where they fuse to provide stability and support as an individual matures.

In contrast to synostosis, gomphosis refers to the peg-and-socket joints found in the teeth; symphysis is a type of cartilaginous joint where bones are joined by fibrocartilage, allowing for slight movement; and syndesmosis is another form of fibrous joint where the bones are connected by an interosseous ligament, permitting limited movement. These other types of joints do not exemplify the complete immobility and rigidity that characterizes synostosis.