1. Axial & Appendicular skeleton Axial skeleton related to body skull, vertical column, thoracic cage (두개골, 척추뼈, 흉부) Appendicular skeleton except body arms, girdle, etc.(어깨, 팔, 다리 등) 2. Structure of Bone Osteon : basic structure of bone inside of periosteum Periosteum : The thin layer of fibrous tissue covering outside of bone Compact bone(치밀골) Spongy bone(해면골) : 구멍이 스폰지 처럼 뚫려있다. In bone, there ..