Difference Between Male And Female Ribs


Men and women have 12 pairs of ribs (a few individuals have 13 or 11 pairs). The idea that men have fewer ribs than women is widespread but wrong, perhaps deriving from the biblical story of Eve being made from one of Adam’s ribs.

The first category of ribs, known as true ribs, comprises the initial seven pairs. True ribs are aptly named because they have a direct attachment to the sternum or breastbone through a cartilaginous structure called the costal cartilage. This attachment provides stability to the ribcage and is important in the mechanics of respiration. The true ribs also work as a protective shield for the heart and lungs.

Following the true ribs, there are three pairs of false ribs. These ribs, numbered 8th to 10th, differ from true ribs in that they do not attach directly to the sternum. Instead, they connect indirectly to the sternum through the costal cartilage of the rib above them. This arrangement gives them the name “false ribs.” While they lack the direct connection of true ribs, they still contribute to the structural integrity of the ribcage and offer additional protection to the abdominal organs.

Lastly, the 11th and 12th pairs of ribs are referred to as floating ribs. Unlike true and false ribs, they do not attach to the sternum or its cartilage at all. These ribs have a free, unattached anterior end. Although they have a limited role in the mechanics of respiration, floating ribs protect the lower organs like the kidneys, from potential damage.

Collectively, these ribs form the ribcage which contribute to the process of breathing. As the ribcage expands during inhalation and contracts during exhalation, it aids in the expansion and contraction of the lungs, enabling the intake of oxygen and the removal of carbon dioxide.

Male vs female rib cage at a glance

Male vs Female Ribs: Key Differences

Basis of ComparisonMale RibsFemale Ribs
Size and LengthGenerally larger and longerSmaller and shorter
Angle of the RibsOften greater angle relative to the spineLess angle, resulting in a narrower chest
Shape of the SternumWider and more roundedNarrower and may have a slight triangular shape
Costal CartilageLonger costal cartilageShorter costal cartilage
Rib 1Less mobile and often more firmly attached to the sternumMore mobile and less firmly attached
Floating Ribs (11 and 12)May be slightly longer and less mobileSlightly shorter and less mobile
Rib Angle and FlareGreater angle and flare outwardLess pronounced angle and less flare
Ribcage ShapeMore cylindricalSlightly conical
Rib AlignmentMay exhibit a more “V” shapeMay appear more “U” shaped