An Etymological Dictionary of the German Language/Schulter
Schulter, f., ‘shoulder,’ from the equiv. MidHG. schulter, OHG. scultarra, f., corresponding to Du. schouder, AS. sculdor, E. shoulder, Dan. skulder, Swed. skuldra. This undoubtedly genuine Teut. word is wanting in Goth.; its origin is obscure.