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Some models may have changeable genital inserts and other interchangeable parts which permit a unisex model to represent an individual of either sex. [citation needed] Although 3D computer models of anatomy now exist as an alternative, physical anatomical models still have advantages in providing insight into anatomy. [2]
ZygoteBody, formerly Google Body, is a web application by Zygote Media Group that renders manipulable 3D anatomical models of the human body. Several layers, from muscle tissues down to blood vessels, can be removed or made transparent to allow better study of individual body parts. Most of the body parts are labelled and are searchable.
The Anatomography website is maintained by the DBCLS (Database Center for Life Science) non-profit research institute located at the University of Tokyo. Anatomical diagrams generated by Anatomography, and 3D polygon data used on the website (called BodyParts3D), are freely available under the Creative Commons Attribution-ShareAlike license.
Methods for simulating deformation, such as changes of shapes, of dynamic bodies involve intensive calculations, and several models have been developed. Some of these are known as free-form deformation, skeleton-driven deformation, dynamic deformation and anatomical modelling.
The axial skeleton (80 bones) is formed by the vertebral column (32–34 bones; the number of the vertebrae differs from human to human as the lower 2 parts, sacral and coccygeal bone may vary in length), a part of the rib cage (12 pairs of ribs and the sternum), and the skull (22 bones and 7 associated bones).
Computer generated models used in skeletal animation are not always anatomically correct. However, organizations such as the Scientific Computing and Imaging Institute have developed anatomically correct computer-based models. Computer generated anatomical models can be used both for instructional and operational purposes.