ball-and-socket joint, enarthrosis, cotyloid joint, articulatio spheroidea, spheroid joint, enarthrodial joint
臼状関節、 球関節
a freely moving joint in which a sphere on the head of one bone fits into a rounded cavity in the other bone
骨の頭部の球面が、他の骨の丸い窩洞にぴったりと入り込む可動関節