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The triceps extension is an isolation exercise that works the muscle on the back of the upper arm. The triceps extension exercise is an isolation exercise because it involves movement in only one joint, the elbow joint. The overhead tricep extension is an isolation exercise targeting the triceps just as effectively as the tricep pulldown. The triceps extension can be beneficial for individuals recovering from tricep or shoulder injuries as it allows for gentle muscle activation without placing too much strain on injured tissues.
| Characteristics | Values |
|---|---|
| Number of heads | 3 |
| Muscle type | extensor |
| Location | back of the upper arm |
| Origin | just below the socket of the scapula (shoulder blade) and at two distinct areas of the humerus, the bone of the upper arm |
| Insertion | olecranon process of the ulna, in the forearm |
| Function | extension of the forearm upon the elbow joint |
| Innervation | radial nerve, axillary nerve, ulnar nerve |
| Oxygen and nutrient supply | deep brachial artery |
| Training | pushing or extension movements |
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What You'll Learn
Triceps brachii is a three-headed muscle
The triceps brachii is the only muscle in the posterior compartment of the arm. It represents the only constituent of the posterior muscle group of the arm, spanning almost the entire length of the humerus. The superior portion of the long head of the triceps is covered by the posterior border of the deltoid muscle. The long head of the triceps can be palpated as an elevation parallel and medial to the posterior border of the deltoid muscle when the elbow is extended. On its course, the long head of the triceps descends through the wedge-shaped interval between the teres major and minor and the humerus, creating three distinct anatomical spaces.
The main function of the triceps brachii is the extension of the forearm at the elbow joint. Its long head also contributes to the extension and adduction of the arm at the shoulder joint. The triceps brachii also plays a role in creating anatomical spaces that are traversed by neurovascular structures. This makes the triceps brachii an important surgical landmark.
All three heads of the triceps brachii are innervated by the four branches of the radial nerve (C7, C8). However, according to some studies, the long head of the triceps is innervated by the axillary nerve, and in rare cases, it receives dual innervation from both the radial nerve and the axillary nerve. The muscle is supplied with oxygen and nutrients from the branches of the deep brachial artery.
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It originates below the shoulder blade
The triceps, or triceps brachii, is a muscle with three heads or points of origin. It is a large extensor along the back of the upper arm in humans. The triceps brachii is the only muscle in the posterior compartment of the arm. It is the only constituent of the posterior muscle group of the arm, spanning almost the entire length of the humerus.
The triceps muscle consists of a long, medial, and lateral head. The long head originates from the infraglenoid tubercle of the scapula, which is just below the shoulder blade. The medial head arises proximally in the humerus, just inferior to the groove of the radial nerve. The lateral head originates from a narrow, linear ridge on the posterior surface of the humerus, just superior to the radial groove.
The long head gets an additional contraction when the arm is behind the torso because it crosses the shoulder joint. The long head also assists with the extension and adduction of the arm at the shoulder joint. The medial head is active during extension of the forearm at the elbow joint when the forearm is supinated or pronated. The lateral head is also active during extension of the forearm at the elbow joint, particularly when the forearm is supinated or pronated.
The triceps muscle contracts when the elbow is straightened and expands when the elbow is bent. The three heads converge into a single tendon distally, attaching to the olecranon process of the ulna. The triceps' primary function is extending the forearm at the elbow joint, which opposes the action of flexors such as the biceps brachii.
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Triceps are targeted with pushing or extension movements
The triceps muscle is a large muscle on the back of the upper limb of many vertebrates. It is also referred to as the triceps brachii, which means "three-headed muscle of the arm". The triceps muscle consists of three parts: the medial, lateral, and long head. All three heads converge to form a single tendon that attaches to the olecranon process of the ulna, in the forearm. Its primary function is the extension of the forearm at the elbow joint, which is the straightening of the arm. This is in opposition to the flexion movement produced by the biceps brachii.
The triceps are best targeted with pushing or extension movements. The medial and lateral heads are targeted with pressing and pushdown movements, while the long head is targeted with overhead extension movements. Examples of isolation movements include cable push-downs, lying triceps extensions, and arm extensions behind the back. These exercises work the triceps in isolation.
Compound elbow extension movements, such as pressing movements, are also effective for targeting the triceps. Examples include push-ups, the JM press, bench press, close grip bench press, military press, and dips. A closer grip during these exercises targets the triceps more effectively than a wider grip. Static contraction movements such as pullovers, straight-arm pulldowns, and bent-over lateral raises can also be used to build the triceps.
Overall, the triceps can be effectively targeted through a variety of exercises, including isolation movements, compound elbow extension movements, and static contraction movements. By incorporating these exercises into a training routine, individuals can effectively work the triceps muscle and promote muscle growth and strength.
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Ruptures are rare and occur in steroid users
The triceps brachii is a large muscle on the back of the upper limb of many vertebrates, including humans. It is commonly referred to as the triceps and is composed of three parts: the medial, lateral, and long head. All three heads converge into a single tendon that crosses the elbow joint, with the long head also crossing the shoulder joint. The triceps is responsible for the extension of the forearm upon the elbow joint, opposing the biceps brachii.
Ruptures of the triceps muscle are rare, but they do occur, especially in anabolic steroid users. Anabolic steroid abuse by weightlifters is the most common predisposing factor for triceps tendon ruptures. Both systemic steroids and local injections can increase the risk of tendon rupture. Oral steroid abuse may negatively affect the mechanical properties of connective tissue, leading to detrimental effects on athletes.
Triceps tendon ruptures can result from traumatic incidents or chronic overuse. Chronic overuse, leading to degenerative changes at the insertion point, is the more common cause. The initial diagnosis of a triceps tendon rupture is often missed, and a thorough clinical examination is crucial to avoid misdiagnosis. Magnetic resonance imaging (MRI) is considered the gold standard for evaluating the size and extent of the tear. Early diagnosis increases the chances of successful direct repair.
Treatment options for triceps tendon ruptures include both operative and non-operative approaches. Operative treatment is typically indicated for full-thickness or large partial-thickness tears, while direct repair may be possible for selected chronic tears. In some cases, a graft may be required to reconstruct the tendon. After triceps repair surgery, a hinged splint can be used to facilitate early controlled motion. This splint restricts elbow flexion while allowing dynamic or gravity-assisted elbow extension. Patient education is essential during the recovery phase to prevent active elbow extension, which could lead to avulsion or rerupture of the repaired tendon.
Reruptures of the triceps tendon can occur in up to 21% of cases. With proper treatment and rehabilitation, patients can expect a functional range of motion, with an average loss of extension and flexion. At one year, peak strength is estimated to be approximately 80% compared to the uninjured side, with endurance strength reaching 99%.
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Triceps tendonitis can cause chronic elbow pain
The triceps muscle is a large muscle on the back of the upper arm in humans. It is a three-headed muscle, with three points of origin, and is also referred to as the triceps brachii. The triceps tendon connects the triceps muscle to the back of the elbow bone.
Triceps tendonitis occurs when the triceps tendon becomes inflamed or injured. This is often caused by overuse of the elbow in activities such as weightlifting, boxing, throwing, hammering, or dips, which involve repetitive motions that irritate the tendon. Triceps tendonitis can also be caused by chronic or heavy steroid use, or certain diseases such as diabetes and rheumatoid arthritis.
Triceps tendonitis typically causes pain at the back of the elbow, which may be accompanied by stiffness, swelling, and redness due to increased blood flow to the area. The pain will be more intense with pushing or pulling movements, and the patient may experience a sharp pain when extending the elbow, especially against resistance. The patient may also experience weakness in the triceps muscle and shoulder due to the tendon's inability to fully support the function of the muscle.
If a patient presents with these symptoms, a doctor will conduct a physical examination of the elbow and ask the patient to move their arm to indicate the areas of pain. X-rays and MRIs may also be ordered to rule out other problems with the elbow, such as arthritis, and to assess the extent of the tendon damage.
Initial treatment for triceps tendonitis typically includes rest, ice, compression, and elevation of the elbow. Over-the-counter anti-inflammatory medications can also help reduce pain and swelling. If these conservative treatments are ineffective, corticosteroid injections may be recommended to reduce inflammation and pain. In severe cases of tendon damage, surgery may be necessary to repair or replace the tendon.
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Frequently asked questions
A triceps extension is an isolation exercise that works the muscle on the back of the upper arm. This muscle, called the triceps, has three heads: the long head, the lateral head, and the medial head. The three heads work together to extend the forearm at the elbow joint.
The triceps extension primarily targets the triceps brachii muscle group, which is located on the back of the upper arm. It also works the shoulder and core muscles to a lesser extent.
Triceps extensions can improve upper arm strength and mobility, as well as stability at the shoulders and core. They can also be beneficial for individuals recovering from tricep or shoulder injuries, as they allow for gentle muscle activation.
