If they occur deep within the body, they form an endoskeleton. When these tissues are located external to the soft parts, the animal is said to have an exoskeleton. Skeletons can be divided into two main types based on the relative position of the skeletal tissues. The skeletal system, often termed skeleton, encompasses the anatomical structures composed of bone and cartilage, or a combination of both, which provide a framework for the body and serve as attachment for muscles. The supporting tissues of an animal that serve to protect the body, or parts of it, and play an important role in physiology. Adaptations have been made for walking and running, speed, power, digging and burrowing, locomotion without limbs (as in snakes), and aerial and aquatic locomotion. The skeletal system has adapted to the needs of many different types of organisms. The vertebrate skeletal system consists of the axial skeleton (skull, vertebral column, and associated structures) and the appendicular skeleton (limbs or appendages). The various structural components of the human skeleton include collagen, three different types of cartilage, and a variety of bone types. If the skeletal tissues occur deep within the body, as in all vertebrates, they form an endoskeleton. When the skeletal tissues are located external to the soft parts of an animal's body, the animal is said to have an exoskeleton. The skeleton is composed of bone and cartilage, or a combination of both, which provide a framework for the body and serve as attachment for muscles. The skeletal system, or skeleton, comprises an animal's supporting tissues, serving to protect the body, or parts of it, and playing an important role in physiology.
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