Opposition

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.

5 Must Know Facts For Your Next Test

1. Opposition primarily involves the thumb touching the tips of the other fingers.
2. The saddle joint at the base of the thumb (carpometacarpal joint) plays a crucial role in opposition.
3. Muscles such as the opponens pollicis are critical for executing opposition movements.
4. Opposition is essential for fine motor skills and dexterity in humans.
5. 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?

Related terms

Flexion:

The bending movement that decreases the angle between two body parts.

Extension:

The straightening movement that increases the angle between body parts.

Abduction:

The movement of a limb or other part away from the midline or axis of the body.