What structures are present in an average square inch (6.4 square centimeters) of skin?

The average square inch (6.4 square centimeters) of skin holds 20 feet (6.1 meters) of blood vessels, 77 feet (23.5 meters) of nerves, and more than a thousand nerve endings. In addition to blood vessels and nerves, there are 645 sweat glands, 65 hair follicles, and 97 sebaceous glands per square inch.