Having 13 ribs instead of the typical 12 pairs (24 ribs) is a rare anatomical variation. It's not a result of gender (as the myth about Adam's rib suggests), but rather a developmental anomaly.
The Extra Rib: Cervical Rib
Most often, the extra rib is a cervical rib. This rib forms above the first rib, at the base of the neck, near the collarbone. It's present from birth. Approximately one in 200 people are born with this extra rib. Source: Flushing Hospital Newsletter, 2018
- Prevalence: The condition is relatively uncommon.
- Development: The extra rib develops during fetal development.
- Location: It typically appears at the base of the neck, above the normal first rib.
While many individuals with a cervical rib experience no symptoms, some may develop Thoracic Outlet Syndrome (TOS). This syndrome occurs in about 10% of those with a cervical rib and can cause symptoms like pain, numbness, and tingling in the arm and hand. Source: Patient.info
Myth vs. Reality
The idea that men have fewer ribs than women is a common myth stemming from the biblical story of Eve's creation from Adam's rib. This is incorrect; both men and women typically have 12 pairs of ribs. A 13th rib is an anomaly, not a gender-specific trait. Source: The Guardian
Other Possibilities (less common):
While a cervical rib is the most frequent cause of having 13 ribs, other rarer anatomical variations could also lead to a slightly altered rib count.
In summary: Most people have 24 ribs (12 pairs). Having 13 ribs is usually due to a single extra rib—a cervical rib—which is a birth anomaly. The presence of an extra rib isn't linked to gender.
