To better understand Ewing's sarcoma, it helps to understand the anatomy of the bones and skeletal system.

The skeleton is a living structure that supports the entire body. Bone is made up of an outer shell of very dense bone that surrounds a honeycomb-like structure of softer bone. Bone mainly consists of protein and calcium. Without calcium, bone will become weak.

The human skeleton can be divided into two sections:

• Axial skeleton:
• A total of 80 bones including the skull, spine, and chest
• Appendicular skeleton:
• A total of 126 bones including the pelvic girdle, limbs, feet and hands

Anatomy examples:

• Internal structure of bone
• The pelvic girdle
• The chest
• The skull
• The spine
• Skeletal system
• Lower extremity
• Hands and wrists
• Feet