Triceps brachii

Triceps brachii

The Triceps brachii is a large, three-headed muscle located on the back of the upper arm. It is responsible for extending the elbow joint and is a crucial muscle in movements that require pushing or pressing.

Anatomy

The triceps brachii consists of three parts: the long head, the lateral head, and the medial head. Each head originates from a different location and all converge to insert at the elbow joint.

Long head

The long head of the triceps originates from the infraglenoid tubercle of the scapula. It is unique because it is the only head of the triceps that crosses two joints—the shoulder and the elbow.

Lateral head

The lateral head of the triceps originates from the posterior surface of the humerus, above the radial groove. This head is most responsible for the visible horseshoe shape of the triceps.

Medial head

The medial head of the triceps originates from the posterior surface of the humerus, below the radial groove. It is the smallest head and is mostly covered by the long and lateral heads.

Function

The primary function of the triceps brachii is to extend the elbow—straightening the arm. It also helps to stabilize the shoulder joint and assist in movements of the forearm.

Clinical significance

Injuries to the triceps brachii can result in a loss of arm extension and are often associated with sports that require a throwing motion. Treatment typically involves rest, physical therapy, and in severe cases, surgery.

See also

• Biceps brachii
• Muscular system
• Elbow joint

Triceps brachii Resources
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References

External links

• Healthline: Triceps Brachii
• Kenhub: Triceps Brachii Muscle