long bone, os longum - in vertebrate animals: a long cylindrical marrow-containing bone of a limb

arm - a human limb; technically the part of the superior limb between the shoulder and the elbow but commonly used to refer to the whole superior limb

endoskeleton - the internal skeleton; bony and cartilaginous structure (especially of vertebrates)

humerus - bone extending from the shoulder to the elbow

radius - the outer and slightly shorter of the two bones of the human forearm

elbow bone, ulna - the inner and longer of the two bones of the human forearm