ANA 407 Lecture Notes - Lecture 6: Brachial Plexus, Biceps, Sternal Angle
26 May 2016
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Describe the bones associated with the pectoral region. ribs. an. The clavicle is one of the most commonly fractured bones, perhaps because it transmits forces to the sternum from the upper limb, which may be reflexly extended during falls. It is the only bone of the pectoral girdle that attaches to the axial skeleton via a true joint, the sternoclavicular joint. The following muscles attach to the clavicle: trapezius, sternocleidomastoid, deltoid, pectoralis major and subclavius. The sternum is composed of three bones, which are (from superior to inferior): the manubrium, body of sternum, and the xiphoid process. The clavicle articulates with the manubrium, as do the first two. At the superior end of the manubrium, the suprasternal notch is important landmark. The junction between manubrium and body of sternum is easily palpated, and marks the position of the second rib. This junction is called the sternal angle (of louis). Describe the muscles of the pectoral region. a.
