Extension - Extensio
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Angular movement occurs only between the long bones, and by it the angle between the two bones is increased or diminished. It take place backward for the extension.
This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).
General Anatomy > Joints; Articular system > Extension