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Mediastinum , mediastinum
1. A membrane in the midline of the thorax of mammals that separates the lungs.
2. The space between the two lungs, which is occupied by… fifth , fifth / fi(f)[unvoicedth]/ • ordinal number constituting number five in a sequence; 5th: the fifth century bc. ∎ (a fifth/one fifth) each of five equ… Myocardium , my·o·car·di·um / ˌmīəˈkärdēəm/ • n. Anat. the muscular tissue of the heart. DERIVATIVES: my·o·car·di·al / -dēəl/ adj.
myocardium (my-oh-kar-diŭm) n.… Wall , wall / wôl/ • n. a continuous vertical brick or stone structure that encloses or divides an area of land: a garden wall farmland traversed by dryston… Wailing Wall , Wailing Wall Aortic valve , aortic valve n. a semilunar valve in the heart, lying between the left ventricle and the aorta, that prevents the backflow of blood from the aorta to…
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