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The anconeus is a small muscle located at the elbow, attaching the humerus and ulna. Although the anconeus muscle is active during elbow extension, its importance to the movement is likely minimal. The primary muscle responsible for elbow extension is the triceps brachii. Functionally, the anconeus performs the same tasks as the triceps muscle at the elbow. Its contraction results in forearm extension at the elbow. Additionally, it maintains the tension of the dorsal joint capsule, preventing damage during hyperextension.
| Characteristics | Values |
|---|---|
| Muscle Name | Anconeus |
| Location | Elbow |
| Function | Extension of the forearm at the elbow |
| Nerve Supply | Motor branch of the radial nerve (C6-C8) |
| Anatomical Variation | Found in ~34% of humans, with one clinically relevant variation: the anconeus epitrochlearis muscle |
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What You'll Learn
- The anconeus muscle is active during elbow extension
- The anconeus muscle is supplied by a motor branch of the radial nerve
- The anconeus constitutes a continuation of the triceps
- The anconeus muscle is responsible for the extension of the forearm at the elbow
- An anatomical variation of the anconeus is found in about 34% of all humans
The anconeus muscle is active during elbow extension
The anconeus is a small, triangular muscle located at the elbow. It connects the humerus and ulna bones and permits the extension of the forearm.
Some researchers have suggested that the anconeus could contribute up to 15% of the extension moment during isometric contractions. It is believed to play an important role when torque values are low. Additionally, the anconeus is active during resisted pronation-supination movement, indicating that it contributes to elbow stability.
The anconeus muscle can be affected by conditions such as cubital tunnel syndrome and tendonitis, which can cause pain and inflammation. Treatment for anconeus pain typically involves protecting and resting the muscle, applying ice, compression with an elastic bandage, and elevation.
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The anconeus muscle is supplied by a motor branch of the radial nerve
The anconeus muscle is a superficial extensor muscle that assists in the extension of the forearm. It originates at the medial epicondyle of the humerus, crossing the ulnar groove of the bone. The anconeus muscle is supplied by a motor branch of the radial nerve, with roots C6-C8. This nerve passes through the lower triangular space and descends inside the spiral radial groove against the humerus. From here, two muscular branches extend to the lateral and medial heads of the triceps muscle.
The second branch of the radial nerve innervates the medial head of the triceps brachii and continues distally to provide innervation for the anconeus muscle. This branch is more distal than the first and is responsible for innervating the medial head of the triceps brachii. The anconeus muscle is also supplied by the recurrent interosseous branch of the posterior interosseous artery and a small number of musculocutaneous perforators.
The skin over the anconeus muscle is supplied by the T1 spinal nerve. The anconeus muscle is functionally a continuation of the triceps brachii muscle, exhibiting the same action at the elbow. Its contraction leads to the extension of the forearm. The long attachment of the anconeus muscle to the ulna is believed to provide an additional function of abducting the ulna during pronation movements of the forearm. This action is essential for stabilising the ulna and allowing the rotatory movement of the forearm, such as when using a screwdriver.
The anconeus epitrochlearis variant of the anconeus muscle can cause compression of the ulnar nerve in cases of hypertrophy, such as in weightlifters. This compression can lead to numbness in the ulnar side of the hand, specifically the little and ring fingers, as well as pain in the elbow, known as cubital tunnel syndrome. Accurate diagnosis of cubital tunnel syndrome involves assessing sensory changes in the ulnar nerve distribution, pain, atrophy of the intrinsic muscles of the hand innervated by the ulnar nerve, and neural provocation tests.
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The anconeus constitutes a continuation of the triceps
The anconeus is a small, triangular muscle in the arm, located at the posterior aspect of the elbow joint. It extends from the distal humerus to the proximal ulna. The anconeus muscle is considered by some to be a continuation of the triceps brachii muscle. This is because the anconeus and the triceps brachii share similar functions and are often either partly or completely blended together.
Functionally, the anconeus muscle acts as an agonist to the triceps brachii during elbow extension. It also supports the elbow in full extension and prevents the elbow joint capsule from being pinched in the olecranon fossa during movement. Additionally, the anconeus abducts the ulna, allowing for the rotatory movement of the forearm, such as when using a screwdriver. This abduction of the ulna is essential for stabilising the elbow joint and enabling minute movements with the radius on the ulna. For example, it allows any finger to be used as an axis of rotation for the forearm.
The anconeus is innervated by a branch of the radial nerve (cervical roots 7 and 8), which arises at the radial sulcus of the humerus. This nerve supply is shared with the triceps muscle, further supporting the idea that the anconeus is a continuation of the triceps. The anconeus receives its blood supply from the middle collateral artery, a branch of the profunda brachii artery. Trauma to the nerve supply of the anconeus muscle can result from various injuries, such as shoulder dislocation or fractures of the upper humerus or olecranon.
The anconeus muscle is easily palpable just lateral to the olecranon process of the ulna. This accessibility makes it useful for clinical examinations or procedures requiring muscle palpation. The anconeus originates on the posterior surface of the lateral epicondyle of the humerus and inserts on the superior posterior surface of the ulna and the lateral aspect of the olecranon.
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The anconeus muscle is responsible for the extension of the forearm at the elbow
The anconeus is a small muscle located at the elbow, attaching the humerus and ulna bones. It is supplied by a motor branch of the radial nerve (C6-C8), which arises at the radial sulcus of the humerus and continues through the medial head of the triceps. The anconeus muscle is active during elbow extension, but its importance in this movement is likely very small compared to the triceps brachii muscle. However, functionally, the anconeus performs the same tasks at the elbow as the triceps muscle. When the anconeus contracts, it leads to the extension of the forearm at the elbow. Additionally, it maintains the tension of the dorsal joint capsule, preventing damage during hyperextension.
An anatomical variation of the anconeus muscle, known as the anconeus epitrochlearis muscle, is found in about 34% of all humans. While most of these variations are harmless, there is one variant that is considered clinically significant. Overall, the anconeus muscle plays a role in extending the forearm at the elbow, working alongside the triceps muscle to facilitate this movement.
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An anatomical variation of the anconeus is found in about 34% of all humans
The anconeus is a small, triangular muscle located at the elbow, attaching the humerus and ulna. It belongs to the superficial extensor compartment and assists in the extension of the forearm, providing support for both the dorsal capsule of the humeroulnar joint and the ulna itself. The anconeus muscle is innervated by a branch of the radial nerve, arising from root value C6-C8. Its skin is supplied by the T1 spinal nerve.
An anatomical variation of the anconeus is found in about 34% of humans. Most of these variations are harmless. However, one variation, the anconeus epitrochlearis muscle, is clinically relevant. This variant of the anconeus muscle originates at the medial epicondyle of the humerus, crossing the ulnar groove of the bone. As the ulnar nerve courses in this groove, in cases of hypertrophy, such as in weightlifters, the anconeus epitrochlearis can cause a compression of the ulnar nerve. This compression results in numbness of the ulnar side of the hand, specifically the little and ring fingers, as well as pain in the elbow, known as cubital tunnel syndrome.
The anconeus epitrochlearis muscle can be distinguished from the "normal" variation by its origin at the medial epicondyle of the humerus, crossing the ulnar groove. This variation can have important implications for certain individuals, particularly those engaged in activities that may lead to hypertrophy, such as weightlifting. Accurate diagnosis of cubital tunnel syndrome, which may be caused by the hypertrophy of the anconeus muscle, includes assessing sensory changes, pain, and atrophy in the affected area.
Trauma to the nerve supply of the anconeus muscle can result from various injuries, such as shoulder dislocation, fractures of the upper part of the humerus, or damage to the olecranon or radial nerve. Such trauma can paralyze the anconeus muscle and other extensors of the elbow and wrist. Additionally, any disease that compromises muscular functions, particularly arm extension, will affect this accessory muscle.
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Frequently asked questions
The anconeus is a small, triangular muscle located at the elbow. It is part of the extensor compartment of the forearm muscles.
The anconeus assists in the extension of the forearm and provides support for the dorsal capsule of the humeroulnar joint and the ulna. It also helps with elbow stability during forearm rotation.
Anconeus epitrochlearis is an anatomical variation of the anconeus muscle found in about one-third of all humans. It originates at the medial epicondyle of the humerus and can cause a compression of the ulnar nerve in cases of hypertrophy, resulting in cubital tunnel syndrome.
Cubital tunnel syndrome is a condition caused by the compression of the ulnar nerve, resulting in numbness in the ulnar side of the hand and pain in the elbow.
Treatment of pain in the anconeus muscle involves releasing the trigger point causing the pain. Conservative therapy includes trigger point injections with local anesthetic or saline solution, and administration of antidepressants to address underlying depression and anxiety.
