It covers a significant portion of the mid-chest and is very strong. The sternal body is located at the level of vertebral bodies T5-T9. For access to the superior mediastinum, suprasternal goiter or thymus, some thoracic surgeons will only make a midline incision in the manubrium. On either side of this notch, one will feel the thick attachment from the clavicles. During a physical exam of the chest, one noticeable feature of the manubrium is the presence of the suprasternal notch. The manubrium is also the widest and thickest segment of the sternum. Anatomically, the manubrium is located at the level of thoracic vertebral bodies T3 and T4. The sternal body and xiphoid process soon follow the manubrium in development. The most superior portion of the sternum is the manubrium, and it is also the first to form during embryogenesis. In sporadic cases, the sternum may not fully form, and the underlying heart may be exposed. The three separate bone segments of different size and shape that make up the sternum include 1) the thick manubrium, 2) long body of the sternum, and 3) the xiphoid process. The vertical bone of the chest, the sternum, defines the anterior chest wall. Once the ribs leave the vertebrae, they gently curve around the lateral thoracic wall and approach the anterior wall of the thoracic cavity. An articular capsule surrounds the head of each rib, and the attachment to the transverse process is made with the help of the radiate ligament. At the level of the spine, the ribs articulate with the costal facet of two opposing vertebrae. Ribs eight to ten are known as false ribs because they lack direct attachment to the sternum. Ribs 11-12 are termed floating ribs because they do not attach directly to the sternum. Ribs eight to ten only attach to the inferior part of sternum via the costal cartilages. The first seven ribs are termed true ribs and attach to the manubrium and directly attach to the body of the sternum. Ribs 10-12, due to their short course, they do not reach the sternum. Ribs 10-12 are relatively short and attach to the costal margins of the ribs just above them. The first nine ribs curve around the lateral thoracic wall and connect to the manubrium and sternum. The thoracic wall consists of a bony framework that is held together by twelve thoracic vertebrae posteriorly which give rise to ribs that encircle the lateral and anterior thoracic cavity.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |