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 may divide into two nerve bundles in the distal forearm and appear as a bifid median nerve in the carpal tunnel. It has an incidence of ~3%. The median nerve usually divides into two or three branches after exiting the distal edge of the transverse carpal ligament that covers the carpal tunnel. These subdivide into digital nerves that supply opposing sides of the digits.