Dominic Stone
The elbow is a complex joint that allows for significant motion and function, primarily in the form of extension and flexion. The elbow joint connects the upper and lower arms, with several tendons connecting the bones and muscles that meet at the elbow. The elbow joint is made up of articulations of mainly the distal humerus and the proximal ulna, with additional articulations between the proximal radius and the humerus, and the proximal radius and ulna. Muscles that move the elbow include the biceps brachii, triceps brachii, brachioradialis, anconeus, and brachialis. These muscles help to flex or extend the arm, with extensors located on the inside of the arm and flexors at the back of the elbow.
| Characteristics | Values |
|---|---|
| Elbow Joint Connects | Upper and lower arms |
| Elbow Joint Composition | Cartilage, muscles, ligaments, nerves, blood vessels |
| Elbow Movement | Extension, Flexion, Supination, Pronation |
| Elbow Muscles | Biceps Brachii, Triceps Brachii, Brachioradialis, Anconeus, Brachialis, Pronator Teres, Pronator Quadratus, Supinator |
| Elbow Nerves | Radial, Ulnar, Median, Musculocutaneous, Lateral Antebrachial Cutaneous, Medial Antebrachial Cutaneous |
| Elbow Ligaments | Medial Collateral Ligament, Lateral Collateral Ligament, Annular Ligament, Quadrate Ligament, Oblique Cord, Anterior Radio Ulnar Ligament |
| Elbow Bursae | Intratendinous Olecranon, Subtendinous Olecranon, Subcutaneous Olecranon Bursa |
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What You'll Learn
Elbow flexion and extension
The elbow joint is a complex synovial hinge joint that connects the upper and lower arms. It is formed where the humerus meets the radius and ulna. The elbow joint allows for significant motion and function, primarily in the form of extension and flexion.
Elbow Extension
Elbow extension is the straightening of the arm, moving the lower arm outward and away from the body. This movement is controlled by extensor muscles, which are located on the inside of the arm. The following muscles are involved in elbow extension:
- Triceps brachii
- Anconeus
- Pronator teres
- Pronator quadratus
- Brachioradialis
Elbow Flexion
Elbow flexion is the bending of the arm, pulling the lower arm inward toward the body. This movement is controlled by flexor muscles, which are located at the back of the elbow. The following muscles are involved in elbow flexion:
- Biceps brachii
- Brachialis
- Brachioradialis
- Pronator teres
It is important to note that while these muscles are primarily responsible for elbow flexion and extension, they may also contribute to other movements or have additional functions in the arm and forearm.
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Elbow flexor muscles
The elbow joint is a complex synovial hinge joint that connects the upper and lower arms. It is where the humerus meets the radius and ulna. The elbow joint allows for significant motion and function, primarily in the form of extension and flexion. The elbow can move in four directions: extension (straightening the arm outward), flexion (bending the lower arm inward toward the body), supination (moving the palm up), and pronation (moving the palm down).
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Elbow extensor muscles
The elbow joint connects the upper and lower arms, allowing for a wide range of movements. Elbow muscles are generally referred to as flexors or extensors, depending on their role in elbow movement. Extensor muscles are located on the inside of the arm and are responsible for extending the arm outward, away from the body.
The triceps brachii is the major elbow extensor. It is a muscle located at the back of the upper arm and is responsible for extending the arm and stabilising the elbow during fine movements. All three heads of the triceps are active when there is heavy resistance to extension, making it a powerful extensor.
The anconeus muscle is another extensor that helps extend the forearm at the elbow.
The pronator teres is considered a secondary elbow flexor, but it also functions to pronate the forearm, which involves moving the palm of the hand down. The brachioradialis is also a flexor of the elbow, particularly in the mid-prone position, and it can also pronate or supinate the forearm.
The nervous system plays a crucial role in elbow movement. For example, during forceful supination of the forearm, the biceps muscle is recruited due to its ability to match the task at hand. This recruitment comes at a "cost," as it requires the activation of a shoulder extensor muscle like the posterior deltoid to neutralise unwanted shoulder flexion.
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Elbow tendons
The elbow joint is formed by three major bones: the humerus, the ulna, and the radius. This joint connects the upper and lower arms, allowing for flexion and extension of the forearm, as well as rotation and twisting of the lower arm. Tendons, along with muscles, ligaments, and nerves, are crucial components of the elbow's anatomy, facilitating its movement and flexibility.
Tendons are connective tissues that attach muscles to bones, enabling the elbow joint's range of motion. The elbow contains two major tendons, the triceps tendon, and the biceps tendon, which play pivotal roles in elbow movement. The triceps tendon allows the elbow joint to straighten, while the biceps tendon enables the joint to bend. These tendons are susceptible to injuries, with activities like sports, keyboard use, and improper lifting straining the elbow muscles and tendons, potentially leading to tendon tears and inflammation.
The ECRB muscle and tendon are often implicated in tennis elbow, a condition characterized by damage to the ECRB muscle and tears in the ECRB tendon, which attaches to the lateral epicondyle. Tennis elbow causes pain and tenderness around the lateral epicondyle and can be treated with braces, steroid injections, and platelet-rich plasma therapy.
Golfer's elbow, on the other hand, affects the tendon on the inside of the elbow, causing similar symptoms. Tendon tears can be partial or complete, leading to muscle detachment from the bone. Symptoms include swelling, bruising, pain, and weakness.
The elbow's tendons are integral to its functionality, enabling the joint to straighten and bend and facilitate a wide range of movements. However, the elbow's complexity and frequent use make it prone to injuries, requiring proper care and, in some cases, medical attention and treatment.
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Elbow ligaments
The elbow is a hinge joint that connects the upper and lower arms, allowing the arm to move in four directions: extension, flexion, supination, and pronation. This joint is composed of various tissues, including cartilage, muscles, ligaments, nerves, and blood vessels.
Ligaments are like cords that connect bones together. The elbow contains two collateral ligaments: the medial collateral ligament (MCL) and the lateral collateral ligament (LCL). The MCL, also known as the ulnar collateral ligament (UCL), connects the inside edge of the humerus to the ulna. The MCL is composed of three ligamentous portions: the anterior bundle (AMCL), the posterior bundle, and the transverse ligament (Cooper ligament). The AMCL and posterior bundle originate from the medial epicondyle of the distal humerus, creating ligamentous tension with elbow flexion. The MCL acts as a primary stabilizer of the elbow, especially during valgus stress, and is the most commonly injured ligament in overhead throwing athletes due to the extreme valgus stress caused by the throwing motion.
The LCL, on the other hand, connects the outside edge of the humerus to the ulna. It contains four ligamentous portions: the lateral ulnar collateral ligament (LUCL), radial collateral ligament (RCL), annular ligament, and accessory collateral ligament. The LUCL and RCL originate from the inferior surface of the lateral epicondyle of the humerus and provide consistent tension through the elbow's range of motion.
In addition to these collateral ligaments, there is also the annular ligament, which wraps around the head of the radius and connects it to both the ulna and humerus. This ligament plays a role in allowing pronation and supination of the elbow.
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Frequently asked questions
Extensors are muscles that help extend the arm outward. They are located on the inside of the arm. Two extensor muscles—the pronator teres and pronator quadratus—let you move your lower arm away from your body.
Flexors are muscles located at the back of the elbow that pull the arm closer to the body by bending the elbow. The biceps brachii, for example, is a powerful flexor that twists the forearm, turning the palm upward.
The triceps brachii is a muscle at the back of the upper arm that extends the arm and stabilizes the elbow during fine movements. The brachioradialis is a forearm muscle that flexes the arm at the elbow. The anconeus helps extend the forearm at the elbow. The brachialis helps flex the elbow inward toward the body.
The elbow is the second most commonly injured joint in sports-related injuries. Tendon tears can occur with repetitive stressful use, causing swelling, bruising, pain, and weakness. Tennis elbow and golfer's elbow are common tendon injuries that cause pain in the outside and inside of the elbow joint, respectively.
