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The axes of rotation of rib movement is two; one corresponding with a line drawn through two articulations which the ribs forms with the spine (a, b); and the other with a line drawn from one of these (head of rib) to the sternum (A, B); the motion of the rib around the latter axis being somewhat after the fashion of raising the handle of a bucket.

Movement of Ribs

The axes of rotation of rib movement is two; one corresponding with a line drawn through two articulations…