Which term means two bones joined with osseous material?

Which term means two bones joined with osseous material?

• A. Synarthrosis
• B. Syndesmosis
• C. Synchondrosis
• D. Synostosis

Answer: (D)

When two bones are joined by bone tissue, the gap between them is closed by osseous material, forming a single, fused bone. This is called a synostosis. It’s a bony joint created by bone-to-bone fusion, so there’s no joint space left. This differs from other joint types that are connected by fibrous tissue (syndesmoses) or cartilage (synchondroses). A synarthrosis refers to an immovable joint, which can be fibrous or cartilaginous but isn’t necessarily a bone-to-bone fusion. Synostosis specifically describes the scenario where bone bridges the connection, such as when growth ends and the epiphysis fuses to the diaphysis, or when skull sutures ossify into a solid bone.

When two bones are joined by bone tissue, the gap between them is closed by osseous material, forming a single, fused bone. This is called a synostosis. It’s a bony joint created by bone-to-bone fusion, so there’s no joint space left. This differs from other joint types that are connected by fibrous tissue (syndesmoses) or cartilage (synchondroses). A synarthrosis refers to an immovable joint, which can be fibrous or cartilaginous but isn’t necessarily a bone-to-bone fusion. Synostosis specifically describes the scenario where bone bridges the connection, such as when growth ends and the epiphysis fuses to the diaphysis, or when skull sutures ossify into a solid bone.