Histology Guide. Skin functions and Layers Some facts about skin Skin is the largest organ of the body.
It has an area of 2 square metres (22 square feet) in adults, and weighs about 5 kilograms. The thickness of skin varies from 0.5mm thick on the eyelids to 4.0mm thick on the heels of your feet. Histology. Histology Contents. Histology.