Triceps muscle

Triceps Brachii Muscle

Triceps brachii muscle (shown in red). Image via Gray's Anatomy.

The Triceps Brachii Muscle is a large, three-headed muscle located at the back of the upper arm. It is responsible for the extension of the elbow joint and is a crucial muscle in the upper body.

Anatomy

The Triceps Brachii Muscle 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.

Long Head

The long head originates from the infraglenoid tubercle of the scapula. It is unique as it crosses two joints, the shoulder and the elbow.

Lateral Head

The lateral head originates from the posterior surface of the humerus, superior to the radial groove.

Medial Head

The medial head originates from the posterior surface of the humerus, inferior to the radial groove.

Function

The primary function of the Triceps Brachii Muscle is to facilitate the extension of the elbow joint. It also plays a role in the stabilization of the shoulder joint and assists in the extension and adduction of the arm.

Clinical Significance

Injuries to the Triceps Brachii Muscle can result in a loss of arm extension. This can significantly impact daily activities and overall quality of life. Treatment options include physical therapy, medication, and in severe cases, surgery.

See Also

• Biceps Brachii Muscle
• Brachialis Muscle
• Elbow Joint
• Shoulder Joint