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.
Regulation Z. Under Regulation Z, a Federal Reserve Board rule covering provisions of the Consumer Credit Protection Act of 1968, lenders have to tell you certain terms of the credit they're offering, in writing, before you borrow. Also known as the Truth in Lending Act, the regulation stipulates that lenders must disclose the true cost of loans. For example, they must make the interest rate, annual percentage rate (APR), and other terms of the loan simple to understand.