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.
The kidneys are popularly described as being bean-shaped and reddish in color. They are located in the middle region of the back, with one on either side of the spinal column. Each kidney is about 12 centimeters long and 6 centimeters wide. Blood is supplied to each kidney through an artery called the renal artery.he kidneys are popularly described as being bean-shaped and reddish in color. They are located in the middle region of the back, with one on either side of the spinal column. Each kidney is about 12 centimeters long and 6 centimeters wide. Blood is supplied to each kidney through an artery called the renal artery.