Why do some people have an extra set of ribs?

Cervical rib is a genetic mutation which causes some people to be born with one or two extra ribs between the base of the neck and the collarbone. People born with this condition may have one extra rib on either side, or one extra rib on both sides.

Is having an extra rib common?

Each adult has 206 bones, 24 of which are ribs (12 on each side), but approximately one out of every 200 people have an extra rib. This rib is referred to as the cervical rib.

How rare is it to have 2 extra ribs?

Their presence is a congenital abnormality located above the normal first rib. A cervical rib is estimated to occur in 0.2\% (1 in 500 people) to 0.5\% of the population. People may have a cervical rib on the right, left or both sides.

Is an extra rib hereditary?

In general, both genetic and environmental factors are thought to be involved. There have been animal studies investigating the role of HOX genes in causing extra ribs. Studies have also suggested environmental exposures, such as maternal exposure to foreign chemicals or stress during pregnancy could play a role.

What happens if you have an extra rib?

Symptoms include pain, tingling or weakness in the shoulder and arm, especially when raising the arms. Having a cervical rib (an extra rib extending from the neck) increases your chance of developing thoracic outlet syndrome. Different types of thoracic outlet syndrome call for different treatments.

Is it normal to have 11 pairs of ribs?

Abnormal Number of Ribs It is more common to see 11 pairs in the absence of associated anomalies; this situation occurs in 5\%–8\% of normal individuals. Eleven pairs of ribs occur in one-third of patients with trisomy 21 syndrome (,9), as well as in association with cleidocranial dysplasia and campomelic dysplasia.

What is the 13th rib?

Lumbar (or 13th) ribs are a rare anatomical variant and represent transitional vertebrae at the thoracolumbar junction with a prevalence of ~1\% 1. It presents as an additional rib coming off T13 or L1 (depending on numbering classification) and may be unilateral or bilateral.

How can you tell if you have an extra rib?

Symptoms. If the extra rib does press on a vessel or nerve, you may have any of the following symptoms: pain in the shoulder and neck, which spreads into the arm: this may come and go or be constant. moments where you lose feeling and have weakness or tingling in the affected arm and fingers.

Can scoliosis cause thoracic outlet syndrome?

Scoliosis is also linked to thoracic outlet entrapment, through its ability to create myofascial trigger points (TrPs) and/or fibrotic contracture in the scalene muscles of the neck (Simons et al., 1999b; Sanders et al., 1990).

How do you know if you have an extra rib?

Why do I have 13 pairs of ribs?

Nine of these 12 patients had 13 pairs of ribs. None of the patients with a short gap atresia had 13 pairs of ribs. Hence, the presence of 13 pairs of ribs is a good indicator of long gap atresia. In a child who has TEF with 13 pairs of ribs, suitable modifications in operative procedure can be planned.

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