Some anatomical factors affecting the stabilising functions of muscles

Summary(1) The action of a muscle upon a joint is not independent of the attachment from which it pulls upon the moving bone.(2) Muscles which are prime movers when acting from their anatomical origins are joint stabilizers when acting from their anatomical insertions, and conversely.(3) The fibrous tendon sheaths, and the lumbrical and interosseus muscles are joint-stabilizing mechanisms.