Thorax: The area of the body that is located between the abdomen and the neck. Within the thorax are the lungs, the heart, and the first section of the aorta. Also known as chest. SLIDESHOW Sex-Drive Killers: The Causes of Low Libido See Slideshow From Healthy Resources 11 Ways to Treat Your Psoriasis NaturallyFood Dos and Don’ts to Tame InflammationHere’s What Head Lice Actually Look Like Featured Centers Good and Bad Foods for PsoriasisVideo: Getting Personal on Life With MS Health Solutions From Our Sponsors Shot-Free MS Treatment Your Child and COVID-19