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.
Three Main Regions of the Kidney. -Renal cortex-a smooth area/most superficial region-Renal pyramids-located in the medulla and has cone shaped pyramids that have extensions of the cortex (the base of each pyramid faces the cortex) -Renal papilla-is the apex that is pointed towards the renal sinus.Renal cortex-a smooth area/most superficial region-Renal pyramids-located in the medulla and has cone shaped pyramids that have extensions of the cortex (the base of each pyramid faces the cortex) -Renal papilla-is the apex that is pointed towards the renal sinus.