In the image below, which letter is labelling a sternocostal joint?

Question

BlackTom AI · Accepted Answer

Sternocostal joints are the articulations between the costal cartilages of the true ribs and the sternum, so the correct label must point to where a rib’s cartilage meets the body of the sternum.

1) Relevant knowledge points and concepts
- True ribs (1–7) attach to the sternum via their costal cartilages. The joints formed are called sternocostal joints (ribs 2–7 are synovial plane joints; the 1st is a synchondrosis).  
- The manubriosternal joint (sternal angle) is the junction between manubrium and body of the sternum (not a sternocostal joint).  
- Vertebral bodies and intervertebral joints are posterior and unrelated to sternocostal joints.

2) Step-by-step reasoning
- Locate each labeled arrow on the image: A points to the lateral upper rib area near the manubrium, B points toward the superior/anterior midline region (around the sternal angle/manubrium), C points directly to the lateral margin of the sternal body where a costal cartilage inserts, and D points inferiorly at a vertebral body.  
- The sternocostal joint is specifically where a costal cartilage contacts the surface of the sternum (on the body for ribs 2–7). The arrow labeled C is exactly at that cartilage-to-sternum contact.

3) Calculations
- None required for anatomical identification.

4) Why the correct answer is correct
- C marks the junction of a costal cartilage with the sternal body — this is the sternocostal joint.

5) Why the other options are incorrect
- A: near the upper margin/manubrium region and not clearly marking the costal cartilage-surface of the sternal body.  
- B: indicates the manubriosternal/superior region (the sternal angle), which is an inter-sternal joint, not a costal cartilage articulation.  
- D: points to a vertebral body (posterior spine), not part of the sternocostal articulation.  
- “None of the letters” is incorrect because C clearly shows a sternocostal articulation.

6) Conclusion
- Therefore the label identifying a sternocostal joint is C, which matches the provided correct answer.

In the image below, which letter is labelling a sternocostal joint?Single choice

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