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Skeletal System

The human skeletal system performs a number of key functions in the human body. The key functions of the human skeletal system are:

Support: Our bones provide the rigidity we need to function.
Protection: The rigidity of our bones allows them to protect our internal organs from damage for example the rib cage and the skull.
Movement: Without the strength of our bones we wouldnt be able to move our muscles are anchored to our bones.
Storage: Our bones are a storehouse for fat and certain essential minerals.
Divisions of Human Skeleton:
Human skeleton can be divided into two divisions.
Axial Skeleton:
Blood cell formation: Most of our blood components are made in the bones.

Skull: Skull is that part of human skeleton that forms the bony framework of the head. It consists of 22 different bones that are divided into two groups: bones of cranium and bones of face.
Vertebral Column: It is a flexible column of vertebrae, connecting the trunk of human body to the skull and appendages. It is composed of 33 vertebrae which are divided into 5 regions: Cervical, Thoracic, Lumbar, Sacral, and Coccygeal.
Rib Cage: It is a bony cage enclosing vital human organs formed by the sternum and ribs. There are 12 pairs of ribs that are divided into three groups: True ribs, False ribs, and Floating ribs.

SOURCE:

http://www.nrpt.co.uk/training/body/skeletal/index.htm
http://www.mananatomy.com/body-systems/skeletal-system