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sterna sternum的复数形 sternum的复数形 Sterna n 1: a genus of Sterninae [ synonym: { Sterna}, { genus Sterna}] Sternum \ Ster" num\, n.; pl. L. { Sterna}, E. { Sternums}. [ NL., from Gr. ?, the breast, chest.] 1. ( Anat.) A plate of cartilage, or a series of bony or cartilaginous plates or segments, in the median line of the pectoral skeleton of most vertebrates above fishes; the breastbone. [ 1913 Webster] Note: The sternum is connected with the ribs or the pectorial girdle, or with both. In man it is a flat bone, broad anteriorly, narrowed behind, and connected with the clavicles and the cartilages of the seven anterior pairs of ribs. In most birds it has a high median keel for the attachment of the muscles of the wings. [ 1913 Webster] 2. ( Zool.) The ventral part of any one of the somites of an arthropod. [ 1913 Webster]
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