The human body is divided into eleven major systems :

The muscular system

The skeletal system

The integumentary system (the skin nails,hair, sweat & oil glands)

The respiratory system

The digestive system

The urinary system

The reproductive system

The nervous system

The endocrine system

The cardiovascular system

The lymphatic and immune system

Although massage and bodywork can affect all the systems as they are all intricately connected to each other, the main ones we are dealing with are musculo-skeletal ; The lymphatic, nervous, circulatory, integumentary and cardiovascular systems are also directly effected through bodywork and reflexology can effect the entire system