Opposition
from class:
General Biology I
Definition
Opposition is the movement that brings the thumb and fingers together, enabling grasping and manipulation of objects. It is a key function of the hand, involving coordinated actions of muscles, bones, and joints.
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5 Must Know Facts For Your Next Test
- Opposition primarily involves the thumb touching the tips of the other fingers.
- The saddle joint at the base of the thumb (carpometacarpal joint) plays a crucial role in opposition.
- Muscles such as the opponens pollicis are critical for executing opposition movements.
- Opposition is essential for fine motor skills and dexterity in humans.
- Injuries or conditions affecting opposition can significantly impair hand function and grip strength.
Review Questions
- What joint is primarily involved in the movement of opposition?
- Which muscle is most important for performing opposition?
- Why is opposition considered vital for fine motor skills?
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