3/23/2023 0 Comments Opposable thumbs definition![]() In addition, you might want to watch our anatomy and physiology lectures on YouTube, or check our anatomy and physiology notes. Take a free opposition and reposition quiz to test your knowledge, or review our opposition and reposition video. See a demonstration of opposition and reposition in the anatomy review video below: During reposition, the thumb and finger return to their original position. ![]() Reposition is the opposite action of opposition. In fact, think about this: when the opposition movement occurs, what happens? In the picture above, did you notice how the thumb and finger created a shape similar to the letter ‘O’? The ‘O’ stands for opposition! Now you can easily remember this motion of our opposable thumbs! Reposition of the Thumb Opposition is the special movement of our opposable thumbs. A super easy way to remember this is that you’ve probably heard someone say that humans have opposable thumbs. Opposable thumbs not only impact our lives, but they also function as powerful. ![]() Opposition of the thumb occurs when the tip of the thumb comes to meet (and oppose) the tip of another finger from the same hand. Definition of opposable 1 : capable of being opposed or resisted 2 : capable of being placed against one or more of the remaining digits of a hand or foot the opposable human thumb What is the advantage of an opposable thumb Benefits of opposable thumbs. Thanks to this saddle joint, the thumb can perform circumduction, flexion and extension, abduction and adduction, as well as special movements called opposition and reposition. They call it a saddle joint because, well, it kinda looks like a saddle (yee-haw, cowboy!). The thumb, also known as the pollex or digit one, articulates (forms a joint) with the trapezium bone of the wrist (carpus) via a saddle joint, which is a type of synovial joint featuring interlocking convex and concave surfaces.
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