Sutures are best described as which type of joint?

• A. Suture
• B. Interosseous membrane
• C. Epiphyseal plate
• D. Intervertebral disc

Answer: (A)

In anatomy, joints are categorized by the tissue connecting the bones. Sutures are a type of fibrous joint between the skull bones, bound by dense connective tissue with no joint cavity, and they are essentially immovable in adults (synarthrosis). This tissue arrangement makes sutures a classic fibrous joint, designed for strong, bite-sized binding of skull bones while allowing growth of the skull during development. The other options fit different joint types: an interosseous membrane is a syndesmosis, another fibrous joint but not a suture; an epiphyseal plate is a cartilaginous joint (growth plate) that participates in bone lengthening; and an intervertebral disc is a cartilaginous joint (a symphysis) that provides cushioning and limited movement. So sutures are best described as fibrous, immovable joints between skull bones.