The ribs and rib cage room excellent examples of the human being body’s multi-faceted and multi-functional design.

They are strong enough to assistance the skeleton and protect the critical organs in the chest cavity, including the heart, lungs, and spleen. Yet, the ribs and rib cage are likewise flexible sufficient to expand and contract as the lungs fill and release through the breath.

You are watching: Do women have one more rib

In this article, learn an ext about the variety of ribs human beings have, what their duty is, and whether women have more than men.


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Most human being are born through 12 ribs on each side of the body, do a total of 24 ribs.

Some world are born with more than 24 ribs. These extra ribs are referred to as supernumerary ribs. When human being are born with less than 24 ribs, the is referred to as agenesis that the ribs.

To obtain an idea of just how many civilization had an unusual number of ribs, researchers lugged out a study on 188 pregnant women, who were each carrying a single fetus. The examine revealed the 92% the fetuses had a typical amount the ribs, 5.3% had actually fewer, and also 2.7% had actually more.

The very first seven sets of ribs are dubbed true ribs. Costal cartilage anchors them come the edge of the sternum, or breastbone, in the center of the chest at the former of the body. These ribs connect to the thoracic vertebra of the spinal shaft in the back.

Ribs 8–10 are known as false ribs. These carry out not affix to the sternum individually. Instead, costal cartilage anchors them to the ribs over them. They jointly share a cartilage connection to the sternum by blending into the cartilage of rib 7. This ribs likewise connect come the thoracic vertebrae in the back.

Sets 11 and 12 space floating ribs, and they only attach to the thoracic vertebrae the the spinal shaft in the back.

It is the flexible costal cartilage that permits the ribs to broaden when human being take deep breaths.

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Extra ribs

Supernumerary ribs take place in around 0.5% of the population. Typically, they build on the critical vertebra that the neck (the 7th cervical vertebra) above the normal first rib. They are called cervical ribs, and also they usually construct in pairs, although some world may only have actually one cervical rib.

Supernumerary ribs can also grow out of the lumbar spine listed below rib 12, however this only creates in around 1% that the population,

Much of the time, cervical ribs perform not cause any kind of symptoms. However, they can press on and constrict nerves and also blood vessels, which can create a condition called thoracic outlet syndrome.