What are the two parts of endoskeleton?

The two parts of the endoskeleton are the axial skeleton and the appendicular skeleton. The axial skeleton comprises the skull, vertebral column, and rib cage, providing support and protection for the brain, spinal cord, and thoracic organs. The appendicular skeleton includes the limbs and their associated girdles (shoulder and pelvic), facilitating movement and interaction with the environment. Together, these components form the internal framework of vertebrate organisms.