Dominic Stone
The triceps, or triceps brachii, is a large muscle found on the back of the upper limb of vertebrates. It is one of the two major muscle groups of the arm, with its counterpart being the biceps. The triceps is an extensor muscle of the elbow joint and is made up of three parts: the medial, lateral, and long head. The triceps brachii is the only muscle in the posterior compartment of the arm and is responsible for the extension of the forearm at the elbow joint.
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What You'll Learn
The triceps brachii is a three-headed muscle
The triceps gets its name from the Latin "triceps brachii", meaning "three-headed muscle of the arm". The three heads of the triceps brachii originate from their respective attachments on the humerus and scapula and converge onto a common tendon, which inserts on the ulna in the forearm. The medial head does not attach to the scapula and therefore has no action on the glenohumeral joint. The long head of the triceps brachii also crosses the shoulder joint, and it contributes to the extension and adduction of the arm at the shoulder joint.
The triceps brachii is responsible for extension of the forearm at the elbow joint. It contracts when the elbow is straightened and expands when the elbow is bent. The medial head is active during extension of the forearm at the elbow joint when the forearm is supinated or pronated. The medial head also enables more precise, low-force movements, while the lateral head is used for movements requiring occasional high-intensity force. The long head is employed when sustained force generation is required or when there is a need for synergistic control of the shoulder and elbow.
The triceps brachii also plays a role in creating anatomical spaces that are traversed by neurovascular structures, making it an important surgical landmark. Additionally, the triceps reflex, elicited by striking the triceps tendon, is often used to test the function of the nerves of the arm, specifically spinal nerves C6 and C7, with a focus on C7.
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The triceps is the only muscle in the posterior compartment of the arm
The triceps, or triceps brachii, is a large muscle found on the back of the upper arm in many vertebrates, including humans. It is an extensor muscle of the elbow joint and an antagonist of the biceps and brachialis muscles. The triceps is the only muscle in the posterior compartment of the arm.
The triceps gets its name from the Latin "tri" (three) and "ceps" (head), referring to its three points of origin or fascicles: the long, medial, and lateral head. These three heads converge onto a single tendon to insert onto the olecranon process of the ulna. The triceps brachii is the only constituent of the posterior muscle group of the arm, spanning almost the entire length of the humerus.
The long head of the triceps arises from the infraglenoid tubercle of the scapula, or shoulder blade, and crosses both the elbow and shoulder joints. The medial head arises proximally in the humerus, just inferior to the groove of the radial nerve, and from the dorsal (back) surface of the humerus. The lateral head originates from a narrow, linear ridge on the posterior surface of the humerus, just above the radial groove.
The triceps muscle contracts when the elbow is straightened and expands when the elbow is bent. It is the muscle primarily responsible for the extension of the forearm at the elbow joint, in opposition to the biceps brachii. The long head of the triceps also contributes to the extension and adduction of the arm at the shoulder joint. The triceps can be targeted with pushing or extension movements, such as pushdowns and overhead extensions, to promote muscle growth.
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Triceps are bigger than biceps
The triceps brachii, commonly referred to as the triceps, is a large muscle found on the back of the upper arm in vertebrates. It is an extensor muscle of the elbow joint and an antagonist of the biceps and brachialis muscles. The triceps consist of three parts: the medial, lateral, and long head. All three heads cross the elbow joint, and the long head also crosses the shoulder joint.
The biceps, on the other hand, consist of two heads and are responsible for arm flexion. The triceps, as the name suggests, have three heads and are responsible for arm extension. Due to their larger size, the triceps may be able to lift more weight compared to the biceps. Additionally, the triceps are considered a weaker muscle group relative to the biceps, requiring less stimulus to activate.
In terms of everyday use, the biceps are used more frequently than the triceps. Basic actions such as picking something up or pulling an object towards you involve the use of the biceps. While the triceps are also engaged in these movements, it is to a lesser extent. This frequent use of the biceps may result in greater endurance.
Furthermore, the triceps are the only muscle involved in forearm extension, whereas multiple muscles, including the biceps, are utilised in forearm flexion. This distribution of workload across several muscles in curls or pulling movements may contribute to the perception of the triceps being larger than the biceps.
The triceps and biceps can be targeted through various exercises, with pressing movements like push-ups, bench presses, and dips isolating the triceps more effectively. The biceps, meanwhile, may be slightly easier to train due to the variety of curl variations available.
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Triceps are targeted with pushing or extension movements
The triceps is a muscle with three heads or points of origin: the long head, the lateral head, and the medial head. It is an extensor muscle of the elbow joint, responsible for straightening the arm. The triceps is targeted and strengthened through pushing or extension movements, such as various forms of the bench press, push-ups, and tricep dips. These exercises are considered compound movements as they involve multiple muscles and joints.
Isolation exercises such as tricep extensions are also effective in specifically targeting the triceps muscle. This exercise involves movement in only one joint, the elbow joint, and can be performed with dumbbells, kettlebells, or resistance bands. During a tricep extension, an individual may stand or lie down with their feet in a slight split stance and their weight evenly distributed. They then lift and lower a weight behind their head, engaging the triceps and core to stabilize the body.
The medial and lateral heads of the triceps are best targeted with pressing and pushdown movements, such as cable push-downs and lying tricep extensions. On the other hand, the long head is effectively worked through overhead extension exercises like overhead tricep presses.
The triceps muscle is prone to injuries such as tendonitis and tears, which can be caused by acute trauma or chronic overuse. To reduce the risk of injury, it is recommended to start with lighter weights and gradually increase the intensity. Additionally, proper form and technique are crucial to ensure safe and effective training of the triceps muscle.
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Triceps ruptures are rare
The triceps, or triceps brachii, is a muscle with three heads or points of origin: the medial, lateral, and long head. It is the muscle primarily responsible for the extension of the elbow joint (straightening of the arm). Triceps ruptures are rare injuries to the elbow extensor mechanism, typically affecting weightlifters or older males with underlying illnesses. Triceps tendon tears are uncommon injuries, constituting less than 1% of all upper extremity tendon injuries.
Triceps ruptures are often associated with pre-existing conditions or drug treatments, such as anabolic steroid use, systemic endocrine disorders, renal failure, or local steroid injections. The injury usually occurs due to a fall on an outstretched hand, direct trauma to the elbow, or lifting against resistance. It can also happen after surgery involving the reattachment of the triceps. This type of injury can be very painful and debilitating, and it can significantly impact an athlete's career.
The triceps reflex test, performed by striking the triceps tendon, is used to assess the function of the nerves in the arm, particularly spinal nerves C6 and C7. This test is important for understanding nerve function and determining the appropriate treatment approach.
Treatment for triceps ruptures may involve surgery, immobilization of the arm with a splint or brace, and significant rehabilitation. The recovery process can be lengthy, with most patients regaining a full range of motion and recovery within a year of surgical repair. During the initial 48 to 72 hours after the injury, it is crucial to control swelling, prevent further injury, and reduce pain. Seeking the help of a physical therapist is recommended to ensure proper recovery and guide the patient through the necessary stretching and strengthening exercises.
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Frequently asked questions
A tricep, or triceps brachii, is a muscle in the back of the upper limb of vertebrates with three heads or points of origin.
The three heads of the tricep are the long, medial, and lateral head.
The tricep is an extensor muscle of the elbow joint and an antagonist of the bicep and brachialis muscles. It is responsible for arm extension and can fixate the elbow joint when the forearm and hand are used for fine movements, such as writing.
The tricep can be trained through isolation or compound elbow extension movements. Examples of exercises that target the tricep include cable push-downs, lying tricep extensions, arm extensions behind the back, push-ups, and bench presses.
