Source:http://linkedlifedata.com/resource/umls/id/C1710195
NCI: 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: 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)