How many types of rib bones?

There are 12 pairs of ribs in the human body, divided into three types:

- True ribs: The upper seven pairs of ribs are directly connected to the sternum (breastbone) by cartilage. These are also known as vertebral or sternal ribs.

- False ribs: The next five pairs of ribs are also connected to the vertebrae, but they do not directly connect to the sternum. They are further divided into two categories:

- Superior false ribs: These are the 8th, 9th, and 10th pairs of ribs, and they are connected to the sternum through cartilage that connects them to the 7th pair of true ribs.

- Floating ribs: These are the 11th and 12th pairs of ribs, and they are not attached to the sternum at all. They are only connected to the vertebrae at the back.

- Cervical ribs: These are extra ribs that are sometimes present above the first true rib. They are rare and occur in less than 1% of the population.

The rib bones provide structure and protection for the organs within the chest cavity, including the heart, lungs, and major blood vessels.