NCIt definition : The upper segment of the sternum, quadrangular in shape, as well as wider superiorly
and narrower inferiorly. The sternal manubrium articulates with the clavicle and first
two ribs.;
Alternative definition : CDISC: The upper segment of the sternum, quadrangular in shape, as well as wider superiorly
and narrower inferiorly. The sternal manubrium articulates with the clavicle and first
two ribs. (NCI);