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.
Kidney patients who suffer from darker skin find that their skin color isnât alleviated with the onset of dialysis. That is to say, dialysis is unable to help filter out urochrome. From this point, other treatment is needed to deal with dark skin.