伸展
Extensio
定义
角运动仅发生于长骨之间，通过此运动，两骨之间的角度增大或减小。向后方进行的角运动称为伸展。
參考資料
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/).
