So, these two rib pairs have another name, the floating ribs. How many ribs does the human body have? What are "false" ribs? Saikat R. Mar 7, Explanation: Our thoracic cage or rib cage is composed of 12 pairs of ribs, sternum, cartilages and thoracic vertebrae.
The ribs are classified into three groups based on their relationship to the sternum. Ribs 1—7 are classified as true ribs vertebrosternal ribs. The costal cartilage from each of these ribs attaches directly to the sternum. Ribs 8—12 are called false ribs vertebrochondral ribs.
The costal cartilages from these ribs do not attach directly to the sternum. For ribs 8—10, the costal cartilages are attached to the cartilage of the next higher rib. Thus, the cartilage of rib 10 attaches to the cartilage of rib 9, rib 9 then attaches to rib 8, and rib 8 is attached to rib 7.
The last two false ribs 11—12 are also called floating ribs vertebral ribs. These are short ribs that do not attach to the sternum at all. Instead, their small costal cartilages terminate within the musculature of the lateral abdominal wall.
Although fixed into place, these ribs do allow for some outward movement, and this helps stabilize the chest during inhalation and exhalation. The human rib cage is made up of 12 paired rib bones; each are symmetrically paired on a right and left side.
While there are some cases of minor anatomical variation, men and women generally have the same amount of ribs. A differing rib count between the genders is largely a medical myth. The supraspinatus muscle is a rotator cuff muscle located in the shoulder, specifically in the supraspinatus fossa, a concave depression in the rear…. The quadratus plantae is a muscle in the foot that extends from the anterior front of the calcaneus heel bone to the tendons of the digitorum….
The depressor labii inferioris muscle is a four-sided facial muscle located in the jaw area that draws the lower lip down and to the side. The muscles of the face give it general form and contour, help you outwardly express your feelings, and enable you to chew your food.
Typically, they develop on the last vertebra of the neck the 7th cervical vertebra above the normal first rib.
They are called cervical ribs, and they usually develop in pairs, although some people may only have one cervical rib. 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.
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