As the triceps contracts, it pulls the olecranon posteriorly, causing the forearm to move toward the posterior aspect of the arm. Due to its origin on the scapula, the long head crosses the shoulder joint, granting it a secondary action that is crucial for upper body integrity.
Triceps Brachii Stability Shoulder Joint During Pull
Its long head also plays a critical role in the stabilization of the shoulder joint and the controlled descent of the arm, making it indispensable for both powerful movements and fine motor control. This specific anatomy allows it to act as a stabilizer and extensor of the glenohumeral joint.
The lateral and medial heads originate from the posterior surface of the humerus, while the long head has a more complex origin on the infraglenoid tubercle of the scapula. Despite these separate origins, all three heads converge into a single, thick tendon that inserts on the olecranon process of the ulna, forming the prominent point of the elbow.
Triceps Brachii Stability Shoulder Joint During Pull
Shoulder Extension and Adduction Beyond stabilizing the shoulder, the long head facilitates specific movements of the arm itself. Primary Function: Elbow Extension The most recognized action of the triceps brachii is elbow extension, which occurs when the angle between the forearm and the upper arm increases.
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