How many floating ribs are there




















Saikat R. Mar 7, Explanation: Our thoracic cage or rib cage is composed of 12 pairs of ribs, sternum, cartilages and thoracic vertebrae. Related questions What the chemical messengers that travel in the blood?

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Each of the seven "true" ribs attaches to the breastbone sternum at the front of the chest through cartilage, as well as to the vertebrae of the spine in the back. The remaining ribs 8 through 12 are called "false ribs" as they do not attach to the sternum directly. Instead, they are attached to the costal cartilage of the sternum.

However, the last two pairs of ribs at the very bottom, also known as "floating ribs," do not attach at the front of the rib cage at all—only to the vertebrae in the back. The human rib cage thoracic cage has the very important job of protecting the heart and lungs. The ribs are part of the axial skeleton and are classified as flat bones. The primary job of flat bones is to protect underlying structures. Other flat bones in the human body are found in the pelvis and skull.

Several layers of compact bone and marrow form flat plates. Red blood cells are made in the marrow of flat bones. Due to its cartilaginous attachments and surrounding tendons, the rib cage is able to expand to accommodate the movement of the lungs and diaphragm when breathing. While most of this cartilage remains flexible throughout life, the bottom tip of the sternum—known as the xiphoid process—ossifies becomes hardened with age. As with any bone in the human body, ribs can fracture or break —though the terminology used to describe injuries involving the chest wall and rib cage can be confusing.

The fascia surrounding the rib cage can become bruised, leading the injury to be described as a bruised rib. In terms of broken or fractured ribs, these two terms refer to the same injury or one that occurs in the bone. The key difference between broken, bruised, and fractured ribs is whether the bones of the rib cage are involved or if the injury was primarily to the tissue of the chest wall.

In some cases, both are involved. While a bruised rib might not sound as severe as a broken rib, injury to the tissues that surround and support the rib cage can be extremely painful. Ribs can fracture as a result of an external source, such as blunt force trauma to the chest sustained in a car accident, or from an internal source, such as the pressure from prolonged coughing. While it is not as common as an injury to the chest wall, "slipping rib syndrome" is a curious ailment that can cause distress for people who have it but are not aware of why it occurs.

Slipping rib syndrome also called Cyriax syndrome occurs when the floating ribs, which aren't directly attached to cartilage, move. The movement of these lower ribs is often felt as a slipping, clicking, or popping sensation. The sensation typically only occurs on one side of the rib cage unilateral , but the pain may radiate to the back on the affected side. The sensation can be very painful or simply a source of discomfort.

Slipping rib syndrome may come and go. Much of the time, cervical ribs do not cause any symptoms. However, they can press on and constrict nerves and blood vessels, which can create a condition called thoracic outlet syndrome. Although many people might think that males have fewer ribs than females — most likely sparked by the biblical story of Adam and Eve — there is no factual evidence. Most people have the same number of ribs, regardless of their sex. However, researchers have noted that although they are rare in the general population, cervical ribs are more common in females than males.

Ribs 7—10 , which are the ribs in the middle of the rib cage, tend to break more frequently than the upper and lower ribs. Direct pressure on the ribs from an automobile accident, fall, or other blunt trauma causes most rib fractures. The most common symptom of a broken rib or ribs is pain when coughing or breathing. A person with broken ribs may also feel pain or soreness in their chest, right around the area where the break occurred.

The greatest threat from broken ribs is damage to the structure or function of the internal organs. Flail chest is a serious condition that develops when three or more neighboring ribs break in more than one place, which damages the support capabilities and shape of the rib cage.

This makes breathing much harder. In cases of flail chest, or when any broken ribs become displaced, the broken edge can puncture through the pleural cavity and into the lung. Severe rib fractures can cause pneumothorax , which is a potentially life-threatening condition.

This happens when air leaks into the pleural cavity and pushes down over the lung, causing the lung to collapse. Flail chest may also cause bruising and other damage to the lung tissue, which can lead to acute lung contusion.



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