Extrinsic

not essential or inherent; not a basic part or quality; extraneous

facts that are extrinsic to the matter under discussion.

being outside a thing; outward or external; operating or coming from without

extrinsic influences.

Anatomy . (of certain muscles, nerves, etc.) originating outside the anatomical limits of a part.

adjective

essential , integral , interior , intrinsic , necessary

adjective

acquired , alien , exotic , exterior , external , extraneous , gained , imported , outer , outside , outward , superficial , adventitious , foreign , unessential