What are the two main classifications of the skeleton?

The skeletal system is classified into two main categories: axial and appendicular. The axial skeleton consists of the bones that form the long axis of the body, which includes the skull, vertebral column, and rib cage. This part of the skeleton provides support and protection for the brain, spinal cord, and thoracic organs.

The appendicular skeleton, on the other hand, includes the bones of the limbs and the girdles that attach them to the axial skeleton. This includes the arms and legs, along with the shoulder and pelvic girdles. The appendicular skeleton is essential for movement and interaction with the environment.

Understanding these classifications is crucial for studying anatomy, as they help in recognizing the different functions and locations of various bones. The other classifications listed, such as compact and spongy, refer to types of bone tissue rather than bone structure, while upper and lower does not accurately encompass the full range of skeletal classification.