![]() ![]() The second rib attaches to the sternum at the sternal angle. The manubrium and body join together at the sternal angle, so called because the junction between these two components is not flat, but forms a slight bend. The elongated, central portion of the sternum is the body. The first ribs also attach to the manubrium. This is the site of the sternoclavicular joint, between the sternum and clavicle. The clavicular notch is the shallow depression located on either side at the superior-lateral margins of the manubrium. This can be easily felt at the anterior base of the neck, between the medial ends of the clavicles. The top of the manubrium has a shallow, U-shaped border called the jugular (suprasternal) notch. The manubrium is the wider, superior portion of the sternum. It consists of three parts: the manubrium, body, and xiphoid process. The sternum is the elongated bony structure that anchors the anterior thoracic cage. The last two pairs of false ribs are also known as floating ribs (11–12). The ribs are classified as true ribs (1–7) and false ribs (8–12). ![]() The sternum consists of the manubrium, body, and xiphoid process. The ribs are anchored posteriorly to the 12 thoracic vertebrae. Figure 7.5.1 – Thoracic Cage: The thoracic cage is formed by the (a) sternum and (b) 12 pairs of ribs with their costal cartilages. The thoracic cage protects the heart and lungs. The ribs are anchored posteriorly to the 12 thoracic vertebrae (T1–T12). ![]() It consists of the 12 pairs of ribs with their costal cartilages and the sternum ( Figure 7.5.1). The thoracic cage (rib cage) forms the thorax (chest) portion of the body. Discuss the parts of a rib and rib classifications.Identify the parts of the sternum and define the sternal angle.Discuss the components that make up the thoracic cage.By the end of this section, you will be able to:ĭescribe the components of the thoracic cage ![]()
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