A projecting ridge or fin on the bottom of the hull of a boat or ship that improves directional control and is often weighted for added stability. 2. The principal structural member of an aircraft, resembling a ship's keel in shape and function.
The outer, reddish region, next to the capsule, is the renal cortex. This surrounds a darker reddish-brown region called the renal medulla. The renal medulla consists of a series of renal pyramids, which appear striated because they contain straight tubular structures and blood vessels.
What is Kidney Pain? Kidney pain is a term often used to describe a lower back pain that is more lateral (towards the side) or around the flanks. However the kidneys, despite popular belief, are not located in the lower parts of the abdomen. The kidneys lies just below the diaphragm on either side towards the back of the abdomen in an area known as the retroperitoneal cavity. Back pain is by far the most common cause of what is termed kidney pain.