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Anatomy 3D models are popular too, among them you can find skeletal system 3D models.
A skeleton is a collection of bones, cartilage tissue and ligaments that strengthen them. The oldest known skeleton organism today is considered to be a sponial creature Coronacollina acula that lived on the ocean floor off the southern shores of Australia 550–560 million years ago. By its appearance, it resembled a thimble, from which direct rays radially receded, which served as a skeleton. The old method of making a skeleton is to dry the carcass in the sun or in the hot sand.
Skeletons are usually divided into three types: external (exoskeleton), internal (endoskeleton) and liquid (hydrostatic skeleton).
All vertebrates are characterized by the presence of an internal skeleton (endoskeleton), although there are species in which the endoskeleton is supplemented to a varying degree by the developed external skeleton (exoskeleton) appearing in the skin (for example, bone scales in some fish species). The appearance of a solid skeleton (the outer skeleton of invertebrates) made it possible to protect the body from harmful external influences of the environment. The appearance of the endoskeleton in vertebrates became the skeleton (support and support) for soft tissues, and the transformation of individual parts of the skeleton into levers set in motion by means of muscles gave a new function to the skeleton – the locomotive. Thus, the mechanical function of the skeleton is manifested in the ability to support (attachment of soft tissues and organs to bone tissue), movement (a certain structure of long tubular bones connected by movable joints and set in motion by muscles controlled by impulses from the nervous system) and protection (formation of individual bones of the canal, box, bone cell or bone container). The vertebral canal and cranium protect the tissues and organs of the nervous system, the thorax – the vital organs of the chest cavity (heart and lungs), and the pelvis – the reproductive organs and the bladder. Along with the mechanical function, the vertebrate skeleton also performs a biological function – participation in the body’s metabolism, especially mineral (the skeleton is the container of phosphorus, calcium, iron and other substances), and also performs the hematopoietic function, not only being a defense for the bone marrow, but also presenting it an organic part.
Popular file formats for skeletal system 3D models: 3ds, max, dxf, fbx, c4d, dae, lwo, hrc, xsi, obj