Usborne the complete book of human body

... diagram of a finger shows the main parts of a fingernail The lunula is a crescent-shaped area of pale skin under the bottom of the nail The cuticle is a flap of skin protecting the bottom of the. .. brain The labels on this picture show the main parts of a human eye The pupil is the hole that lets light into the eyeball The retina is -~ the area of light-sensitive cells at the back of the. .. neatly packed together inside the chest and the abdomen (the part of the body between the chest and the legs) The head also has a few organs, including the brain, eyes and ears The biggest organ,