Why is the Rib Cage So Important?

Labeled rib cage anatomy diagram with numbers

The rib cage is like a safety shield for your chest. It’s your body’s natural protection around your lungs and heart. Hug yourself around your chest, and you can feel many hard rib bones. In the mirror, you might see the outline of some of your ribs.

How many ribs do humans have?

Have you heard the myth that males have fewer ribs than females? This is false!
Most humans have 12 pairs of ribs.

Whether you’re a boy or girl, man or woman, you probably have 24 ribs: 12 ribs on the right side and 12 rights on the left. In rare cases, people are born with extra ribs or less ribs.

What is the rib cage made of?

Like most parts of the human skeleton, the rib cage is made of bone and cartilage.

What are the parts of the rib cage?

Sternum (Breastbone)

The sternum is in the front and middle part of the rib cage. This bone is long, vertical, and flat, giving the human heart extra protection. The sternum is also called the breastbone since it is located between the breasts.

12 Pairs of Ribs

Most people have 12 pairs of ribs, which are flat, curved bones. When doctors talk about the rib bones, they give each rib a number from 1 through 12.

  • The first 7 ribs are attached to the sternum with the help of cartilage. These ribs are numbers 1, 2, 3, 4, 5, 6, and 7.
  • The next 3 ribs are attached to the sternum with the help rib number 7’s cartilage. These are ribs number 8, 9, and 10.
  • Ribs 11 and 12 are considered “floating ribs” because they are not attached to the sternum. This allows humans to bend forward at the waist.

All ribs are connected to the vertebrae (backbone).

Peek at the rib cage bones in this video!

What are the soft spaces between the ribs?

If you run your hands up and down your sides, you can feel soft grooves between each rib. These spaces are filled with many important organs:

  • BLOOD VESSELS: Tucked under every rib bone are bundles of veins and arteries. The veins that take away waste and the arteries bring important nutrients to the rib cage.
  • NERVES: Nerves are lined up like wires under each vein and artery. The brain sends messages through those nerves to control your chest muscle movements.
  • MUSCLES: The muscles between each rib move your chest to help you breathe.

What other bones are connected to the rib cage?

The clavicles (collarbone) are attached to the top of the sternum.

Why does the rib cage have so much cartilage?

The rib cage can change its shape and size – all thanks to flexible cartilage!

  • BREATHING – Here are some fun facts about lungs. When you breathe in air, your lungs get bigger. When you breathe out air, your lungs get smaller. This means your rib cage has to get bigger and smaller, too.
  • PREGNANCY – When a fetus (baby) grows bigger in its mother’s uterus, everything in the belly is crowded. The uterus moves up toward the chest to make space for the baby. Because of these changes, the rib cage becomes a little wider during pregnancy. Many pregnant women can also feel the fetus kicking their ribs during pregnancy. Ouch!

Learn more fun facts about your amazing bones!

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Human Body Learning Lab is the best anatomy book for kids! Have fun learning science facts and health tips with cool hands-on projects and diverse, realistic images!

Updated on November 21, 2023 by Betty Choi, MD

Updated on November 21, 2023 by Betty Choi, MD