Others, like the pivot, condyloid, and saddle joints help you have movements in your neck, jaw, and fingers.
其他的,如枢轴关节、髁状关节和鞍状关节可以帮助你的颈部、下颌和手指运动。
Crash Course 解剖生理学篇
For example, your ability to touch your thumb to your fingertips or give a thumbs up is thanks to opposition movement, facilitated by your saddle joint, which makes your thumbs opposable.