Question:medium
The costal cartilages of the 8th and 9th ribs articulate with each other to form which type of joint?
The costal cartilages of the 8th and 9th ribs articulate with each other to form which type of joint?
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Lower costal cartilages glide on each other via small synovial cavities.
Updated On: Jun 24, 2026
- Costochondral joint
- Interchondral joint
- Synovial joint
- Costovertebral joint
Show Solution
The Correct Option is C
Solution and Explanation
Step 1: Identify exactly which connection the question targets. The 8th and 9th costal cartilages do not reach the sternum directly; instead each links to the cartilage above it. So the relevant articulation is between two adjacent costal cartilages.
Step 2: The articulations among the 6th to 10th costal cartilages possess a synovial cavity, making them mobile synovial (plane) joints that permit gliding during breathing. The question asks for the joint type, and that type is synovial. Hence option C.
Step 3: Dismiss the rest. The costochondral joint is the rib-to-its-own-cartilage union and is cartilaginous, not the one described. The costovertebral joint is at the spine, not between cartilages. "Interchondral joint" merely labels the site; the classification being asked for is synovial.
\[\boxed{\text{Synovial joint}}\]
Step 2: The articulations among the 6th to 10th costal cartilages possess a synovial cavity, making them mobile synovial (plane) joints that permit gliding during breathing. The question asks for the joint type, and that type is synovial. Hence option C.
Step 3: Dismiss the rest. The costochondral joint is the rib-to-its-own-cartilage union and is cartilaginous, not the one described. The costovertebral joint is at the spine, not between cartilages. "Interchondral joint" merely labels the site; the classification being asked for is synovial.
\[\boxed{\text{Synovial joint}}\]
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