extrinsic

a. [ L. extrinsecus; exter on the outside + secus otherwise, beside; akin to E. second: cf. F. extrinsèque. See Exterior, Second. ] 1. Not contained in or belonging to a body; external; outward; unessential; -- opposed to intrinsic. [ 1913 Webster ]

The extrinsic aids of education and of artificial culture. I. Taylor. [ 1913 Webster ]

2. (Anat.) Attached partly to an organ or limb and partly to some other part; -- said of certain groups of muscles. Opposed to intrinsic. [ 1913 Webster ]