Medically the evaluation by Stacy Sampson, D.O., specialty in household medicine — created by daniel Dresden on march 12, 2020

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

They are solid enough to support the skeleton and protect the an essential organs in the chest cavity, consisting of the heart, lungs, and spleen. Yet, the ribs and also rib cage are also flexible sufficient to expand and also contract together the lungs fill and release with the breath.

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In this article, learn an ext about the number of ribs human beings have, what their role is, and also whether females have an ext than men.


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Most civilization are born v 12 ribs on every side that the body, make a complete of 24 ribs.

Some world are born with an ext than 24 ribs. This extra ribs are dubbed supernumerary ribs. When world are born with much less than 24 ribs, the is called agenesis of the ribs.

To gain an idea of how many civilization had an unusual variety of ribs, researchers carried out a research on 188 pregnant women, who were each transferring a single fetus. The research revealed that 92% that fetuses had actually a common amount that ribs, 5.3% had actually fewer, and 2.7% had actually more.

The first seven sets of ribs are dubbed true ribs. Costal cartilage anchors them to the leaf of the sternum, or breastbone, in the middle of the chest in ~ the former of the body. This ribs connect to the thoracic vertebra of the spinal shaft in the back.

Ribs 8–10 are recognized 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 link to the sternum by blending right into the cartilage that rib 7. These ribs additionally connect to the thoracic vertebrae in the back.

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

It is the versatile costal cartilage that permits the ribs to broaden when world take deep breaths.

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Extra ribs

Supernumerary ribs take place in about 0.5% the the population. Typically, they develop on the critical vertebra of the neck (the 7th cervical vertebra) above the normal very first rib. Lock are referred to as cervical ribs, and also they usually construct in pairs, although some world may only have one cervical rib.

Supernumerary ribs can likewise grow out of the lumbar spine below rib 12, yet this only develops in around 1% that the population,

Much that the time, cervical ribs perform not cause any type of symptoms. However, they deserve to press on and constrict nerves and blood vessels, i beg your pardon can create a condition called thoracic outlet syndrome.