As A whole the Skeletal System has many different sections which have different purposes and it is hard to say which are the 'five' main parts. However, I would say these are the main parts of a Skeletal System:

1) The Bones of the Skull (Head)

2) The Humerus, Radius, Ulna and Manus (Arms and Hands)(Upper Limb)

3) The Ribs

4) The Spinal Cord and Bones of the Pelvis (Spine and Pelvic Girdle)

5) Femur, Fibula, Tibula and Pedis (Legs and Feet)(Lower Limb)

i think you have mistaken becoz there are two main parts of skeleton and five different regions

for more information refer www.mananatomy.com ? Body Systems

The brain, eye, nose, mouth, and head bone

The tummy, arms, and tit bone

The butt bone

The leg bones

And the funny bone

Cool Star: What happened to the "STERNUM" ? Just trying to "RIB" you a bit !

http://www.ehow.com/facts_5472799_major-...