The ribs and also rib cage are great examples of the human body’s multi-faceted and multi-practical style.

They are strong sufficient to support the skeleton and defend the crucial organs in the chest cavity, including the heart, lungs, and spleen. Yet, the ribs and also rib cage are likewise versatile sufficient to expand also and also contract as the lungs fill and release via the breath.

You are watching: How many ribs does a man and woman have

In this article, learn even more around the number of ribs human beings have actually, what their function is, and also whether women have actually more than guys.


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Most civilization are born with 12 ribs on each side of the body, making a complete of 24 ribs.

Some people are born with more than 24 ribs. These extra ribs are dubbed supernumerary ribs. When civilization are born via less than 24 ribs, it is referred to as agenesis of the ribs.

To obtain an principle of exactly how many kind of people had actually an unusual variety of ribs, researchers carried out a study on 188 pregnant womales, that were each moving a solitary fetus. The examine revealed that 92% of fetuses had a normal amount of ribs, 5.3% had fewer, and also 2.7% had more.

The initially salso sets of ribs are referred to as true ribs. Costal cartilage anchors them to the edge of the sternum, or breastbone, in the middle of the chest at the front of the body. These ribs connect to the thoracic vertebra of the spinal column in the ago.

Ribs 8–10 are well-known as false ribs. These carry out not attach to the sternum individually. Instead, costal cartilage anchors them to the ribs over them. They collectively share a cartilage connection to the sternum by blending into the cartilage of rib 7. These ribs also attach to the thoracic vertebrae in the back.

Sets 11 and also 12 are floating ribs, and they only attach to the thoracic vertebrae of the spinal column in the earlier.

It is the versatile costal cartilage that allows the ribs to expand also as soon as civilization take deep breaths.

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Extra ribs

Supernumerary ribs happen in about 0.5% of the populace. Generally, they build on the last vertebra of the neck (the 7th cervical vertebra) above the normal first rib. They are dubbed cervical ribs, and also they typically build in pairs, although some human being may only have actually one cervical rib.

Supernumerary ribs have the right to additionally prosper out of the lumbar spine listed below rib 12, but this just creates in about 1% of the populace,

Much of the moment, cervical ribs perform not reason any type of symptoms. However, they deserve to push on and also constrict nerves and blood vessels, which can produce a problem referred to as thoracic outlet syndrome.