Table of Contents
In anatomy, the origin and insertion of a muscle refer to the points where the muscle attaches to bones or other structures in the body. These terms help describe the function of the muscle and how it contributes to movement.
Movement
- Origin
- Stationary during action
- Insertion
- Moves during action
Location
- Origin
- Proximal (closer to center)
- Insertion
- Distal (further from center)
Role in Action
- Origin
- Anchor for contraction
- Insertion
- Site of force application
Example
- Origin: The biceps brachii originates at the 🦴 scapula (shoulder blade).
- Insertion: It inserts into the 🦴 radius (forearm bone).
- Action: When the biceps contract, the insertion (🦴 radius) moves closer to the origin (🦴 scapula), bending the elbow.