Skeletal structures refer to the framework of bones and cartilage that support the body of vertebrates, including humans. This framework provides shape, protects vital organs, and facilitates movement by serving as attachment points for muscles. The human skeleton consists of 206 bones, which can be categorized into the axial skeleton (skull, vertebral column, and rib cage) and the appendicular skeleton (limbs and pelvic girdle). In addition to providing support, skeletal structures play a crucial role in producing blood cells and storing minerals like calcium and phosphorus. The process of bone formation and maintenance is regulated by various cells, including osteoblasts, osteoclasts, and osteocytes. Overall, skeletal structures are essential for both physical stability and overall health.