The Structure of the Triceps
The triceps muscles, comprising the long, lateral, and medial heads, play a crucial role in arm stability and strength. Together, these muscles are responsible for elbow extension and arm adduction, or lowering.
Long Head
The long head of the triceps, the largest of the three muscles, originates from the scapula. It extends down the arm and attaches to the ulna. This muscle is essential for complete elbow extension.
In addition to its role in elbow extension, the long head also participates in arm adduction at the shoulder joint. When the arm is close to the body, the long head contributes to adduction by bringing the arm toward the body’s midline.
Lateral Head
The lateral head of the triceps is located on the outer side of the arm. It originates from the upper part of the humerus and also attaches to the ulna. This muscle contributes to the stability and strength of the elbow joint, supporting extension.
Medial Head
The medial head of the triceps, situated on the inner side of the arm, shares its origin with the long head and also attaches to the ulna. In addition to its role in elbow extension, the medial head also plays a role in arm adduction.
Video illustration
Main exercises
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