Human figure with the spine and ribs exposed, and showing veins and arteries in the extremities of the body; astrological signs are linked to the body parts they were thought to influence. Also shown is a vein with incisions for bloodletting. 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. The underlying basis for medical astrology, astrology itself, is considered to be a pseudoscience or superstition as there is no scientific basis for its core beliefs. Zodiac to body part is as follows: 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.