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A skeleton is the structural frame that supports the body of most animals.There are several types of skeletons, including the exoskeleton, which is a rigid outer shell that holds up an organism's shape; the endoskeleton, a rigid internal frame to which the organs and soft tissues attach; and the hydroskeleton, a flexible internal structure supported by the hydrostatic pressure of body fluids.
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).
The appendicular skeleton, comprising the arms and legs, including the shoulder and pelvic girdles, contains 126 bones, bringing the total for the entire skeleton to 206 bones. Infants are born with about 270 bones [ 4 ] with most of it being cartilage, but will later fuse together and decrease over time to 206 bones.
English: diagram of a human female skeleton, back view. the Red lines point individual bones and the names are writen in singular, the blue lines conect to group of bones and are in plural form.
Human_skeleton_diagram.png: (Source: Collier's New Encyclopedia, VIII (New York: P.F. Collier & Son Company, 1921), p. 446. derivative work: GregorDS ( talk ) 09:18, 21 December 2011 (UTC) This is a retouched picture , which means that it has been digitally altered from its original version.