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
The Anatomy Lesson (Roth novel) of nostalgia and ambition, Zuckerman resolves to return to the University of Chicago, his alma mater, in order to pursue medical school. "The Anatomy Lesson" is the least well-received of the Zuckerman trilogy "Zuckerman Bound", though the book was a finalist for the National Book Critics Circle Award and the National Book Award. In "The Observer" in 1984, Martin Amis wrote, "'The Anatomy Lesson' may be the third and final installment of the Zuckerman trilogy, but it is also Roth's second consecutive novel about what success is like. Such fixity!... He has now written two autobiographical novels about the consequences