are ribs that are attached directly to the sternum
1 The ribs from 1-7 are attached to the sternum by coastal cartilage and hence are known as “true ribs”. 2  The 8th, 9th and 10th ribs are not attached directly to the sternum but are attached to the coastal cartilage of the 7th rib, and hence are known as “false ribs”. They are bars of hyaline cartilage that connect the ribs with the sternum. There are a total of 12 ribs divided into three categories on the basis of their articulation with the sternum. The first seven are known as true ribs because their costal cartilages articulate directly with the sternum. It is a flat bone about six inches in length, around an inch wide, and only a fraction of an inch thick.... Click to read more below. The sternum, commonly known as the breastbone, is a long, narrow flat bone that serves as the keystone of the rib cage and stabilizes the thoracic skeleton. Several muscles that move the arms, head, and neck have their origins on the sternum. 1 The lower end of the rib cage is attached to the diaphragm. 2  The bones that form the rib cage are. 3  Sternum-a flat and dagger shaped bone, made up of three bones namely manubrium, body and xiphoid process. The remaining five pairs of ribs are called false ribs because they don’t attach directly to the sternum. Ribs 8–10 attach to cartilage that attaches the true ribs to the sternum, and ribs 11–12 are floating—they do not attach to the sternum or other ribs. The function of ribs is threefold. First, they provide protection for the lungs and heart. The ribs more or less form a “cage” around these very important organs. Sternum. The sternum, commonly known as the breastbone, is a long, narrow flat bone that serves as the keystone of the rib cage and stabilizes the thoracic skeleton. Several muscles that move the arms, head, and neck have their origins on the sternum. Ribs: There are 12 pairs of ribs, all of which are attached posteriorly to the respective thoracic vertebrae. The upper 7 pairs are attached to the sternum directly through their costal cartilages. Ribs 8 through 10 are attached indirectly to the sternum through the seventh costal cartilage. Their costal cartilages are also attached with each other at different points. Definition of Human Rib Cage. A protective structure in the chest region formed by the vertebral column, ribs, coastal cartilages and sternum. Third, they serve as attachment points for chest muscles involved in respiration. The rib cage can be thought of as a handle on a bucket. When we breathe in, the muscles attached to the ribs pull the ribs out just as when you lift the handle on a bucket from the side—it goes out and up. 1 The 8th, 9th and 10th ribs are not attached directly to the sternum but are attached to the coastal cartilage of the 7th rib, and hence are known as “false ribs”. 2  The 11th and 12th ribs are attached to the vertebrae but not to the sternum and hence are known as “floating ribs”.
Yes, but only the upper 7 pairs.