Keel (bird anatomy) keel; and ratites (from "ratis", "raft" — referring to the flatness of the sternum), having a subtle keel structure or lacking one entirely. However, this classification has fallen into disuse as evolutionary studies have shown that many flightless birds have evolved from flighted birds. The current definition of Carinatae now includes all extant birds. Keel (bird anatomy) A keel or carina (plural carinae) in bird anatomy is an extension of the sternum (breastbone) which runs axially along the midline of the sternum and extends outward, perpendicular to the plane of the ribs. The keel provides an anchor to which a
Gray's Anatomy is playing with his train sets. The 1996 Steven Soderbergh film "Gray's Anatomy", featuring monologuist Spalding Gray, also takes its name from the title of the book, as does "Gray's Anatomy: Selected Writings", a 2009 book by British political philosopher John N. Gray. In the 1998 "" episode "", the new Emergency Medical Hologram designed by Ensign Kim begins reciting the contents of "Gray's Anatomy" when activated, beginning with a description of the cell. The American medical drama "Grey's Anatomy" (2005 –) takes its name from the textbook. The name of Jim Leonard Jr.'s 2006 play "Anatomy of Gray", which