What are floating ribs? Why are they called so?

Explanation

**Step-by-Step Solution:**

1. **Definition of Floating Ribs:**
Floating ribs are the last two pairs of ribs in the human ribcage, specifically the 11th and 12th pairs.

2. **Attachment to the Sternum:**
Unlike other ribs, floating ribs do not attach directly to the breastbone (sternum). Instead, they are only attached to the vertebrae at the back.

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