Typically, the accessory renal artery courses into the renal hilum to perfuse the upper or lower renal poles. They may also enter the renal parenchyma directly from the renal cortex (called a polar artery). Rarely, they may arise from the lower thoracic aorta, as well as from the lumbar and mesenteric arteries.
The chain rule can be used to find whether they are getting closer or further apart. For example, one can consider the kinematics problem where one vehicle is heading west toward an intersection at 80 miles per hour while another is heading north away from the intersection at 60 miles per hour.
1 the gold chain placed about Josephs neck, ( Genesis 41:42 ) and that promised to Daniel, ( Daniel 5:7 ) are instances of the first use. In ( Ezekiel 16:11 ) the chain is mentioned as the symbol of sovereignty.  Chains for ornamental purposes were worn by men as well as women. ( Proverbs 1:9 ) Judith 10:4.