Liver spots are flat, brown or black spots that can appear on areas of the skin that are exposed to the sun. They have nothing to do with the liver or liver function. Liver spots are changes in skin color that occur in older skin. The coloring may be due to aging, exposure to the sun or other sources of ultraviolet light, or causes that are not known. Liver spots are very common after age 40. They occur most often on areas that have had the greatest sun exposure, such as the: Backs of the hands.
Median nerve. In the upper arm and near the shoulder, the median nerve branches off of the brachial plexus. It initially spans the length of the upper arm, as it runs a course parallel to the brachial artery. A portion of its path covers the medial side of the arm, near both the biceps brachii and brachialis muscle.
The median nerve is the nerve that runs through the carpal tunnel of the wrist and connects with the thumb and all fingers of the hand, with the exception of the little finger. This nerve originates with the cervical spine and is routed through the arm and forearm. The nerve gathers in compressed form to run through the narrow carpal tunnel and to the fingers. In addition to controlling sensation in the hand, it is also important to the general nerve function of the upper portion of the arm. In relation to the hand, the median nerve controls all sensation and nerve function on the palm side of the thumb. The nerve also manages the process of sensation for the index and middle fingers, and half of the ring finger.