Just as the movement of the heavens was believed to influence the weather, so it was believed that it could influence human physiology. The set of correspondences between the human and the universe has become known by the shorthand "microcosm/macrocosm". Hearkening to Platonic ideas, the microcosm of the human body was thought to contain cosmic relationships of the macrocosm of the universe. Each part of the body was associated with astrological signs:

Aries

Head, eyes, adrenals, blood pressure.

Taurus

Neck, throat, shoulders, ears.

Gemini

Lungs, nerves, arms, heads [sic], fingers.

Cancer

Chest wall, breasts, some body fluids.

Leo

Heart, spine, upper back, spleen.

Virgo

Abdomen, intestines, gallbladder, pancreas, liver.

Libra

Lower back, hips, kidneys, endocrines.

Scorpio

Reproductive organs, pelvis, urinary bladder, rectum.

Sagittarius

Thighs, legs.

Capricorn

Knees, bones, skin.

Aquarius

Ankles, blood vessels.

Pisces

Feet, some body fluids.