Together with other muscles, it is part of the fleshy mass in the first web…, The zygomaticus major muscle is a muscle that controls facial expression, drawing the mouth's angle upward and outward. The bone is divided into three parts: The sternum lies very superficially in the anterior thorax and is easily palpable below the skin of the chest in the midline. The bone covers and protects the heart and great vessels in part, as well as the trachea and esophagus. Copyright © There was an error submitting your subscription. To access the TeachMeAnatomy 3D Model, you must be a premium subscriber. 115 to 117) is an elongated, flattened bone, forming the middle portion of the anterior wall of the thorax. Reviewer: The xiphoid process is the most inferior and smallest part of the sternum. W.M. The manubrium is a large quadrangular shaped bone that lies above the body of the sternum. Anatomy Images: Where is the Sternum Located? It is absent in both turtles and snakes. Either side of the jugular notch, there is a large fossa lined with cartilage. The sternum (or breastbone) is a flat bone located at the anterior aspect of the thorax. In birds an enlarged keel develops, to which flight muscles are attached; the sternum of the bat is also keeled as an adaptation for flight. Another risk associated with the sternum is the fracturing of the xiphoid process during CPR, which can potentially lead to the xiphoid process breaking off and lodging into one of the delicate vital organs below it. The lower border of the manubrium articulates with the body of the sternum at the sternal angle (of louis), it is where the second pair of costal cartilage attaches to the sternum and at the level of the inferior border of T4, is also clinically known as the Angle of Louis. It may…. The xiphoid process does not fully join the body of the sternum until adulthood. 5,610 sternum stock photos, vectors, and illustrations are available royalty-free. SUBJECT INDEX, X. Surface Anatomy and Surface Markings It has facets on its each lateral border for articulation with the costal cartilage of the 3rd to 7th ribs along with the part of second costal cartilage. The lateral edges of the body are marked by numerous articular facets (cartilage lined depressions in the bone). It is endochondral in origin. Our website services, content, and products are for informational purposes only. Body. • Several muscles that move the arms, head, and neck have their origins on the sternum. These adductors are assisted…, A thin strip of tissue, the multifidus muscle starts at the sacral bone at the base of the spine and extends up to the axis, which is commonly…, The opponens digiti minimi is a triangular muscle in the hand. Collarbone injuries may lead to long-lasting pain or limited …

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