The first sense that the human brain senses is the sense of touch. By week 8, a fetus responds to a touch of the cheek and lips and by week 14 other body parts begin to respond as well. Touch assists in an infant’s development by allowing him or her to learn about the world around them and helps the infant bond with others. Nerve cells in the skin inform the brain when it feels sensation. There are two types of receptors on the skin, thermoceptors , which detect temperature, and mechanoceptors, responsible for conveying the presence of deep pressure and high frequencies.
