Manubriosternal joint is ?
**Core Concept**
The manubriosternal joint is a type of synarthrosis that connects the manubrium and body of the sternum, forming the anterior part of the thoracic cage. This joint is essential for the stability and mobility of the thoracic cage during breathing and other movements.
**Why the Correct Answer is Right**
The manubriosternal joint is a symphysis, which means it is a fibrocartilaginous joint that allows for limited movement between the two bones. This limited movement is facilitated by the presence of a fibrocartilaginous disc and the interosseous ligaments that connect the two bones. The manubriosternal joint is a vital component of the thoracic cage, which protects vital organs such as the heart and lungs.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the manubriosternal joint is not a saddle joint, which is a type of synovial joint that allows for limited movement between two bones.
**Option B:** This option is incorrect because the manubriosternal joint is not a cartilaginous joint that connects the sternum to the ribs.
**Option C:** This option is incorrect because the manubriosternal joint is not a plane synovial joint that connects the sternum to the clavicle.
**Clinical Pearl / High-Yield Fact**
The manubriosternal joint is an essential landmark in thoracic surgery and is often used as a reference point for surgical procedures involving the thoracic cage.
**Correct Answer: D. Synarthrosis. Fibrocartilaginous joint.**