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The tricipital muscle, or triceps brachii, is a three-headed muscle of the arm. It is a contractile organ of the body that produces movement. The triceps brachii is a large, thick muscle on the dorsal part of the upper arm, often appearing in the shape of a horseshoe on the posterior aspect of the arm. It consists of three parts: the medial, lateral, and long head. All three heads cross the elbow joint, but the long head also crosses the shoulder joint. The triceps muscle contracts when the elbow is straightened and expands when the elbow is bent.
| Characteristics | Values |
|---|---|
| Definition | A tricipital muscle is a muscle with three heads or points of origin. |
| Types | Skeletal muscle, cardiac muscle, or smooth muscle. |
| Structure | A mass of muscle fibres (venter or belly), attached at each extremity by means of a tendon to a bone or other structure. |
| Function | The tricipital muscle is involved in movements of various organs and parts of the body. |
| Location | The tricipital muscle is typically found in the arm, specifically the back of the upper arm or the dorsal part. |
| Form | The tricipital muscle often appears in the shape of a horseshoe. |
| Composition | The tricipital muscle consists of highly specialized contractile cells and can be divided into the medial head, lateral head, and long head. |
| Innervation | The tricipital muscle is innervated by the radial nerve. |
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What You'll Learn
The triceps brachii muscle has three heads
The triceps brachii muscle, located in the dorsal compartment of the arm, has three heads: the long head, the lateral head, and the medial head. The triceps brachii is the only muscle in the posterior compartment of the arm, and it gets its name from the Latin 'tri' meaning three, and 'cep' meaning head. The three heads originate from their respective attachments on the humerus and scapula and converge into a single tendon, which attaches to the olecranon process of the ulna. The long head of the triceps brachii arises from the infraglenoid tubercle of the scapula, which is a rough area at the inferior margin of the glenoid fossa. Its attachment extends slightly above to the adjacent glenoid labrum and blends with the glenohumeral capsule of the shoulder joint, contributing to its stability. The lateral head originates from a narrow, linear ridge on the posterior surface of the humerus, just superior to the radial groove. A portion of the muscle fibres also arise from the lateral intermuscular septum. The medial head is overlapped by the long and lateral head of the triceps. It has a broad origin along the entire posterior surface of the humerus.
The triceps brachii is a large, thick muscle that often appears in the shape of a horseshoe on the posterior aspect of the arm. Its primary function is the extension of the forearm at the elbow joint, opposing the action of flexors such as the biceps brachii. The long head of the triceps brachii also assists with the extension and adduction of the arm at the shoulder joint. The lateral head is also active during forearm extension at the elbow joint when the forearm is supinated or pronated.
All three heads of the triceps brachii are innervated by the four branches of the radial nerve (C7, C8). However, according to a cadaveric study, the medial head of the triceps brachii is partially innervated by the ulnar nerve. Additionally, research reveals that the long head of the triceps is partially innervated by the axillary nerve. The muscle is supplied with oxygen and nutrients from the branches of the deep brachial artery.
A proximal arm injury may completely paralyse all three heads of the triceps muscle and severely limit the extension of the forearm. Any activity that overuses the triceps muscle can cause the tendon to become inflamed and damaged, resulting in pain and swelling near the muscle's attachment to the olecranon. Axillary nerve damage can impact the long head of the triceps brachii, and early repair is recommended in such cases.
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The triceps is an extensor muscle of the elbow joint
The triceps brachii is a large muscle on the dorsal part of the upper arm. It is the only constituent of the posterior muscle group of the arm, spanning almost the entire length of the humerus. The triceps brachii is a three-headed muscle, with a long, medial, and lateral head. The long head arises from the infraglenoid tubercle of the scapula, which is a rough area at the inferior margin of the glenoid fossa. Its attachment extends slightly above to the adjacent glenoid labrum and blends with the glenohumeral capsule of the shoulder joint, contributing to its stability. The lateral head originates from a narrow, linear ridge on the posterior surface of the humerus, just superior to the radial groove. A portion of the muscle fibres also arise from the lateral intermuscular septum. Its attachment ascends obliquely, beginning from the lateral border of the humerus behind the deltoid tuberusity.
The medial head arises proximally in the humerus, just inferior to the groove of the radial nerve. It arises from the dorsal (back) surface of the humerus and from the medial intermuscular septum. The origin of the medial head is at the dorsal humerus, inferior to the radial groove and connecting to the intermuscular septum. The medial head does not attach to the scapula and therefore has no action on the glenohumeral joint, whether with stabilisation or movement. The medial fascicle enables more precise, low-force movements.
The triceps tendon attachment to the olecranon is susceptible to injury. Any activity that overuses the triceps muscle can cause the tendon to become inflamed and damaged, resulting in pain and swelling near the muscle's attachment to the olecranon.
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The triceps is a large muscle on the back of the upper limb
The triceps muscle is an extensor, responsible for the extension of the forearm at the elbow joint, or the straightening of the arm. It contracts when the elbow is straightened and expands when the elbow is bent. The long head also crosses the shoulder joint, contracting further when the arm is behind the torso. This long head contributes to the extension and adduction of the arm at the shoulder joint, while the lateral head is active during forearm extension when the forearm is supinated or pronated. The medial head, meanwhile, is formed predominantly by small type I fibres and motor units, and enables more precise, low-force movements.
The triceps brachii is the only constituent of the posterior muscle group of the arm, spanning almost the entire length of the humerus. It often appears in the shape of a horseshoe on the posterior aspect of the arm. The muscle develops during the fifth week of embryogenesis, originating from the dorsal muscle mass of the upper limb bud. The arterial supply to the triceps is provided by the deep brachial artery, a branch of the brachial artery, while venous drainage is the brachial vein.
The triceps tendon is susceptible to injury, with overuse of the muscle causing inflammation and damage, resulting in pain and swelling. A proximal arm injury can also paralyse all three heads of the triceps, severely limiting extension of the forearm.
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The triceps brachii is a contractile organ
The triceps brachii is a large, thick muscle on the dorsal part of the upper arm, often appearing as a horseshoe shape. It is the only muscle that lies along the posterior humerus. The main function of the triceps is the extension of the forearm at the elbow joint. The long head of the triceps also contributes to the extension and adduction of the arm at the shoulder joint. The triceps muscle can be trained in a variety of ways, including isolation and compound elbow extension movements.
The triceps brachii also plays a role in creating anatomical spaces which are traversed by neurovascular structures. This makes the triceps brachii an important surgical landmark. The medial bicipital groove, for example, provides a passageway for the brachial artery and median and ulnar nerves. The triceps brachii is innervated by the radial nerve, which gives off a separate branch for each head. The C6 root value of the radial nerve innervates the lateral head, root value C7 innervates the long head, and root value C8 supplies the medial head.
The triceps brachii is susceptible to injury, particularly the triceps tendon attachment to the olecranon. Activities that overuse the triceps muscle can cause the tendon to become inflamed and damaged, resulting in pain and swelling near the muscle's attachment. Ruptures of the triceps muscle are rare and typically only occur in anabolic steroid users. Distal triceps ruptures are also uncommon and usually occur due to a fall on an outstretched hand or a direct blow to the triceps tendon.
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The triceps tendon is susceptible to injury
The triceps tendon is a strong, fibrous tissue that connects the triceps muscle to the bone. It is responsible for extending the elbow and stabilizing the upper arm. The triceps muscle, as the name suggests, has three heads or points of origin: the long head, the lateral head, and the medial head. These three heads converge to form a single tendon that attaches to the elbow, allowing for extension of the forearm. This tendon is crucial for the stability and movement of the elbow joint. However, due to its complex structure and the stresses it endures, the triceps tendon is susceptible to injury.
Injury to the triceps tendon can occur through acute trauma or repetitive overuse. Acute injuries often happen suddenly during activities that involve a forceful contraction of the triceps muscle, such as falling on an outstretched hand or landing on an extended elbow. This can result in a partial or complete tear of the tendon. On the other hand, repetitive overuse injuries develop over time due to the constant stress and wear and tear on the tendon during activities that require frequent elbow extension, such as throwing or lifting heavy objects. This can lead to inflammation and micro-tears in the tendon, causing tendinitis or tendinopathy.
The most common issue affecting the triceps tendon is tendinitis, which is an inflammation of the tendon. This condition often develops gradually and is characterized by pain, swelling, and tenderness at the back of the elbow. Individuals with triceps tendinitis may also experience stiffness and a decreased range of motion in the elbow joint. Another possible injury is a partial or complete tear of the tendon. Partial tears can cause sharp pain and weakness in the arm, while complete tears result in sudden and intense pain, visible deformity, and an inability to extend the elbow.
Certain factors can increase the risk of sustaining a triceps tendon injury. Age is one factor, as the tendon weakens and becomes less flexible over time. Previous injuries to the elbow or tendon can also weaken the tissue and make it more susceptible to future damage. Participating in sports or activities that involve repetitive elbow movements or sudden, forceful contractions of the triceps can put individuals at higher risk. Additionally, conditions that affect the metabolism, such as diabetes or rheumatoid arthritis, can impair the blood supply to the tendon, making it more vulnerable to injury.
To prevent triceps tendon injuries, it is important to maintain strength and flexibility in the arm and elbow. Regular stretching and strengthening exercises can help improve range of motion and stabilize the joint. It is also crucial to use proper form and technique during physical activities to avoid placing excessive stress on the tendon. For those who participate in sports or activities that involve repetitive elbow movements, taking breaks and varying the routine can help reduce the risk of overuse injuries. Additionally, maintaining a healthy weight can reduce the amount of stress placed on the tendon during daily activities.
Early treatment of triceps tendon injuries is crucial for optimal recovery. Rest, ice, compression, and elevation (RICE) are initial steps that can help reduce swelling and pain. Anti-inflammatory medications may also be recommended to manage pain and inflammation. Physical therapy plays a vital role in rehabilitating the tendon and improving strength and range of motion. In more severe cases, such as complete tears, surgery may be necessary to repair the tendon. After treatment, a gradual return to activity is important to prevent re-injury and ensure a full recovery.
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Frequently asked questions
A tricipital muscle is a type of muscle with three heads or points of origin.
The three heads of the tricipital muscle are the long, medial, and lateral head.
The tricipital muscle is located on the dorsal part of the upper arm. It often appears in the shape of a horseshoe on the posterior aspect of the arm.
The main function of the tricipital muscle is the extension of the forearm at the elbow joint. It is also involved in creating anatomical spaces for neurovascular structures.
