What kind of a joint is syndesmosis?
**Core Concept**
Syndesmosis is a type of fibrous joint that allows for limited movement between bones, where the bones are joined together by ligaments, a fibrous membrane, or a syndesmosis ligament. This type of joint is characterized by the absence of a joint cavity and the presence of a syndesmosis ligament that holds the bones together.
**Why the Correct Answer is Right**
The correct answer is a syndesmosis because it is a type of fibrous joint that lacks a joint cavity and is held together by a syndesmosis ligament. This type of joint is found in the inferior tibiofibular joint, where the tibia and fibula are joined together by the syndesmosis ligament. The syndesmosis ligament provides stability to the joint, allowing for limited movement between the bones.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because a synovial joint, such as a hinge joint or a ball-and-socket joint, has a joint cavity and is characterized by a synovial membrane, not a syndesmosis ligament.
**Option B:** This option is incorrect because an amphiarthrodial joint, such as a symphysis pubis, has a fibrocartilaginous joint, but it is not a syndesmosis.
**Option C:** This option is incorrect because a cartilaginous joint, such as an intervertebral disc, is characterized by a fibrocartilaginous disc, not a syndesmosis ligament.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that syndesmosis joints are fibrous joints that lack a joint cavity and are held together by a syndesmosis ligament, which provides stability to the joint. This knowledge is critical in understanding the anatomy and function of various joints in the body.
**Correct Answer: C. Syndesmosis**