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 pain â also called renal pain â refers to pain arising from infection, injury or inflammation of a kidney. You may feel kidney pain as a dull, one-sided ache in your upper back, often accompanied by fever and urinary symptoms. Some people are surprised to learn exactly where the kidneys are located.Your kidneys are located relatively high in your body, under your lower ribs. It's not unusual to attribute back pain or side (flank) pain to your kidneys. But more often than not, your kidneys probably aren't the cause of your back or flank pain.1  Causes.idney pain â also called renal pain â refers to pain arising from infection, injury or inflammation of a kidney. You may feel kidney pain as a dull, one-sided ache in your upper back, often accompanied by fever and urinary symptoms. Some people are surprised to learn exactly where the kidneys are located.