Triceps muscles are primarily used for extending the forearm at the elbow joint.
Functions of the Triceps Brachii
The triceps brachii, located on the back of the upper arm, plays a crucial role in several movements. Its primary function is elbow extension, but its long head also contributes to shoulder joint movements.
- Elbow Extension: This is the main function of the triceps. It allows you to straighten your arm. Think about pushing something away from you or doing a push-up.
- Shoulder Extension (Long Head): The long head of the triceps crosses the shoulder joint. Therefore, it assists in extending the arm at the shoulder, like when bringing your arm backwards.
- Shoulder Adduction (Long Head): The long head also contributes to adduction, bringing the arm closer to the midline of the body.
- Stabilization: The triceps helps stabilize the elbow joint, providing control and preventing unwanted movements.
Breakdown of Triceps Heads
The triceps brachii consists of three heads:
- Long Head: Originates from the infraglenoid tubercle of the scapula. It crosses both the shoulder and elbow joints.
- Lateral Head: Originates from the humerus, superior to the radial groove.
- Medial Head: Originates from the humerus, inferior to the radial groove.
All three heads converge and insert onto the olecranon process of the ulna.
Examples of Triceps Use in Everyday Activities
Here are some examples of how you use your triceps in daily life:
- Pushing open a door: Extending your arm to push the door requires triceps activation.
- Reaching for something on a high shelf: Straightening your arm overhead uses the triceps.
- Performing push-ups: The triceps are essential for extending your arms and lifting your body.
- Throwing a ball: The triceps help extend the arm during the throwing motion.
