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
System anatomy models. One of the key features of the system anatomy is its simplicity. That, of course, means that the anatomy cannot replace other models or design tools. It is only another way of describing the design, in SW tools, on paper or in the heads of the system engineers. The system anatomy can be used as a starting point when creating an integration anatomy (aka project anatomy) that has more use as a project management tool. The following example is a simplified example of a system anatomy for an issue management system. "This anatomy is drawn with the most basic