Keel (bird anatomy) 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 bird's wing muscles attach, thereby providing adequate leverage for flight. Keels do not exist on all birds; in particular, some flightless birds lack a keel structure. Historically, the presence or absence of a pronounced keel structure was used as a broad classification of birds into two orders: Carinatae (from "carina", "keel"), having a pronounced
Grey's Anatomy least fascinating to watch. To write it off is to unnecessarily narrow the definition of what good TV can be, to limit what the medium is capable of. TV is at its best when it emotionally connects, and even when it seems to be otherwise merrily hurtling off a cliff, Grey's Anatomy is nothing but emotional connection, which is more than other, more consistently better shows can say." The series placed at No. 66 on "Entertainment Weekly" "New TV Classics" list, and was declared the third highest rated show for the first ten years of the Internet Movie Database (2002–2012).