Below your neck is the part of your body called the torso.  Sometimes it is just called 'your body'.  The upper front part of your torso is called the chest.  The chest is like a skin and muscle-covered cage.  The cage is made of curved bones called ribs.  Inside this cage are your lungs and your heart.  Below the chest is the area called the abdomen.  Sometimes this area is also called your stomach or belly.  Inside the abdomen, or in the abdominal cavity, are located the actual stomach organ, the liver, the spleen, the large and small intestines, and the bladder.   Women also have their uterus and ovaries in the abdominal cavity.

The rear part of the torso is called the back.  Within each side of the upper back are flat bones called shoulder blades.  Down through the center of the back, from the neck to the bottom of the torso, is a series of bones called the spine or backbone.  The small bones that make up the spine are called vertebrae.  The bottom end of the spine is called the tail bone.  The kidneys are located on either side of the spine inside the lower section of the back.

Below the back and on either side of the tailbone are fleshy mounds called buttocks.  The buttocks provide padding when we sit down.  There are many English words used to refer to a person's buttocks, but some of them are not very polite.  Here are some that are not so bad: backside, rear end, butt, posterior, gluteus maximus (the name of the main muscle in the buttocks).

In the center of the abdomen is a round area of scar tissue called the navel or belly button.  The area around your torso, below your ribs and passing over your navel is called your waist.  The sides of your torso are called sides - left side or right side.