Melothesic figure from "The Guild book of the Barber Surgeons of York",16th century. Melothesia is a discipline that investigates the links existing between the signs of the zodiac, the planets, the Sun, the Moon, and the human body. Medical astrology (Iatromathematics) is an ancient medical system that associates various parts of the body, diseases, and drugs as under the influence of the sun, moon, and planets, along with the twelve astrological signs. Each of the astrological signs is associated with different parts of the human body: Aries: head, face, brain, eyes, Taurus: throat, neck, thyroid gland, vocal tract, Gemini: arms, lungs, shoulders, hands, nervous system, brain, Cancer: chest, breasts, stomach, alimentary canal, Leo: heart, chest, spine, spinal column, upper back, Virgo: digestive system, intestines, spleen, nervous system, Libra: kidneys, skin, lumbar region, buttocks, Scorpio: reproductive system, sexual organs, bowels, excretory system, Sagittarius: hips, thighs, liver, sciatic nerve, Capricorn: knees, joints, skeletal system, Aquarius: ankles, calves, circulatory system, Pisces: feet, toes, lymphatic system, adipose tissue.