Triceps Brachii Muscle: Anatomy and Clinical Significance
Introduction
The triceps brachii is a large muscle of the posterior compartment of the arm. It is primarily responsible for extending the elbow joint and plays a vital role in pushing movements. The muscle also assists in shoulder extension and adduction via its long head.
Anatomy of the Triceps Brachii Muscle
Origin
- Long head: Infraglenoid tubercle of the scapula.
- Lateral head: Posterior surface of the humerus, above the radial groove.
- Medial head: Posterior surface of the humerus, below the radial groove.
Insertion
- Olecranon process: The common tendon inserts on the olecranon of the ulna.
Innervation
- Radial nerve (C6-C8): Supplies all three heads of the triceps.
Blood Supply
- Deep brachial artery (profunda brachii): Main blood supply to the muscle.
Functions of the Triceps Brachii
- Extension of the elbow: Primary action, straightening the arm.
- Shoulder extension and adduction: Via the long head, assists in shoulder movements.
Clinical Significance
Injuries and Disorders
- Triceps strain or tear: Usually caused by trauma or overuse, leading to pain and weakness.
- Radial nerve injury: Can impair extension of the elbow and wrist, leading to wrist drop and loss of triceps function.
- Olecranon bursitis: Inflammation around the olecranon, sometimes associated with triceps injuries.
Signs and Symptoms
- Pain and swelling in the posterior arm and elbow.
- Weakness in elbow extension if nerve injury occurs.
Management
Includes rest, physiotherapy, and surgical intervention in severe cases involving tears or nerve injury.
Summary
The triceps brachii is essential for elbow extension and shoulder movements, with significant clinical importance in injuries affecting its structure or innervation. Understanding its anatomy helps in diagnosing and managing upper limb injuries.
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