Final answer:
To palpate the manubrium, find the jugular notch and the clavicular notches, then palpate downwards to locate the sternal angle where the second rib attaches, which serves as a key landmark for rib identification.
Step-by-step explanation:
To palpate the body of the manubrium, one should start by locating the jugular (suprasternal) notch, which is at the anterior base of the neck between the medial ends of the clavicles.
From the jugular notch, move slightly inferiorly to find the clavicular notch, which signifies the superior-lateral margin of the manubrium. This is the location of the sternoclavicular joints.
Directly beneath the clavicular notches, palpate downward along the midline to identify the sternal angle, which is the junction line between the manubrium and the body of the sternum.
This is also where the second rib attaches, marking an important anatomical landmark. The identification and counting of the lower ribs start from this point, as the ribs 3-7 attach to the sternal body.