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From Biology-Online Dictionary | Biology-Online Dictionary
Trabeculae carneae : muscular ridges projecting in a crisscross fashion from the inner walls of the heart ventricles.
Their structure is important to their role. Had the inner surface of heart ventricles been flat, suction could occur and this would impair the heart's ability to pump efficiently.
Compare: papillary muscle
See also: ventricle, Reils band