Logan Steele
The suprascapular nerve is a mixed motor and sensory nerve that branches from the upper trunk of the brachial plexus. It provides motor innervation to the supraspinatus and infraspinatus muscles, which are part of the muscle group called the rotator cuff muscles. The suprascapular nerve also provides sensory supply to the glenohumeral and acromioclavicular joints. Due to its course through narrow osseoligamentous structures, the suprascapular nerve is susceptible to compressional and traction injuries, which can lead to shoulder pain and muscle weakness.
| Characteristics | Values |
|---|---|
| Type of nerve | Mixed nerve (motor and sensory) |
| Origin | Superior trunk of the brachial plexus |
| Nerve roots | C5 and C6 (and sometimes C4) |
| Main function | Motor innervation for supraspinatus and infraspinatus muscles |
| Sensory supply | Glenohumeral and acromioclavicular joints |
| Blood supply | Suprascapular artery and vein |
| Suprascapular nerve injury | Leading cause of shoulder pain and weakness |
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What You'll Learn
- The suprascapular nerve is a branch of the brachial plexus
- The nerve supplies motor innervation to the supraspinatus muscle
- It also supplies motor innervation to the infraspinatus muscle
- Suprascapular nerve injury can cause shoulder pain and weakness
- The suprascapular artery and vein run alongside the nerve
The suprascapular nerve is a branch of the brachial plexus
The suprascapular nerve has two functions. Firstly, it provides motor innervation to the supraspinatus and infraspinatus muscles, which are two of the four muscles that make up the glenohumeral (shoulder) joint. These muscles are also part of the muscle group called the rotator cuff muscles. Secondly, the suprascapular nerve provides sensory supply to the glenohumeral and acromioclavicular joints.
The suprascapular nerve is susceptible to compressional and traction injuries at the suprascapular and spinoglenoid notches, which can lead to suprascapular nerve palsy. This can cause pain and weakness in the shoulder, with atrophy of the supraspinatus and/or infraspinatus muscles. In cases of suprascapular nerve palsy, surgical decompression of the nerve may be considered after 6-12 months of conservative management.
The suprascapular nerve is accompanied by the suprascapular artery and vein, which provide its blood supply. The suprascapular artery can function as a branch of the thyrocervical trunk or as a direct branch of the subclavian artery. The suprascapular vein travels parallel to the artery.
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The nerve supplies motor innervation to the supraspinatus muscle
The suprascapular nerve is a mixed nerve, providing both sensory and motor supply to the suprascapular region. It is a branch of the superior trunk of the brachial plexus, receiving nerve fibres from the nerve roots C5 and C6, and sometimes C4.
The nerve's primary function is to provide motor innervation to two muscles: the supraspinatus and infraspinatus muscles, which are part of the rotator cuff muscle group. The supraspinatus muscle, which originates from the supraspinous fossa of the posterior scapula, plays a role in abducting the arm and works in synergy with the deltoid and rotator cuff muscles. Innervation from the suprascapular nerve enables the supraspinatus muscle to initiate and assist in arm abduction.
The suprascapular nerve's path begins in the posterior triangle of the neck, where it runs parallel to the belly of the omohyoid muscle. It then passes beneath the suprascapular ligament and enters the supraspinous fossa, where it innervates the supraspinatus muscle. The nerve continues along the superior border of the scapula, through the suprascapular canal, and curves around the lateral border of the scapula's spine through the spinoglenoid notch.
Injuries to the suprascapular nerve can result in pain and weakness in the shoulder region, affecting the supraspinatus and infraspinatus muscles. Suprascapular nerve entrapment syndrome, caused by nerve compression within the suprascapular canal, can lead to shoulder pain, muscular atrophy, and problems with arm abduction and external rotation. To diagnose and manage suprascapular nerve injuries effectively, a thorough understanding of its anatomy is essential.
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It also supplies motor innervation to the infraspinatus muscle
The suprascapular nerve is a branch of the superior trunk of the brachial plexus. It is a mixed nerve, meaning it provides both sensory and motor supply. The nerve is derived from the ventral rami of cervical nerves C5-C6, and occasionally C4. The suprascapular nerve provides motor innervation to the supraspinatus and infraspinatus muscles, which are part of the rotator cuff muscles.
The suprascapular nerve originates in the posterior triangle of the neck, where it runs to the upper part of the scapula, downward and laterally parallel to the belly of the omohyoid muscle. It then passes beneath the suprascapular ligament and through the suprascapular notch to enter the supraspinous fossa. Here, the nerve innervates the supraspinatus muscle.
The nerve then continues through the spinoglenoid notch and into the infraspinous fossa, where it innervates the infraspinatus muscle. The infraspinatus muscle originates in the infraspinous fossa of the posterior scapula and wraps around the lateral proximal humerus to attach to the middle facet of the greater tubercle. This muscle acts to externally rotate the arm and work in synergy with the rotator cuff muscles.
The suprascapular nerve is susceptible to compressional and traction injuries at the suprascapular and spinoglenoid notches. Suprascapular nerve entrapment syndrome can cause shoulder pain and muscular atrophy of the supraspinatus and infraspinatus muscles. Therefore, it is important to have knowledge of the nerve's anatomy to diagnose and provide the best clinical outcomes in cases of nerve injury.
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Suprascapular nerve injury can cause shoulder pain and weakness
The suprascapular nerve is a branch of the superior trunk of the brachial plexus. It is a mixed nerve, meaning it has both sensory and motor functions. The nerve provides motor supply to the supraspinatus and infraspinatus muscles, which are part of the rotator cuff muscles. It also provides sensory supply to the glenohumeral and acromioclavicular joints.
Suprascapular nerve injury or entrapment syndrome is a rare but increasingly recognised cause of shoulder pain and weakness. The nerve is susceptible to damage due to its course through the transverse scapular ligament and spinoglenoid ligament. Trauma, such as falling onto the arm or a direct blow, can cause injury to the nerve. Repetitive overhead movements, as seen in certain sports, can also lead to suprascapular nerve entrapment. In addition, compression of the nerve at the suprascapular or spinoglenoid notch can result in nerve entrapment and subsequent shoulder pain and weakness.
The onset of symptoms following suprascapular nerve entrapment can be gradual, and pain may be dull or burning. The pain is typically located at the back of the shoulder and may radiate to the neck or arm. Weakness of the shoulder muscles, particularly when lifting or with overhead movements, is another common symptom.
Diagnosis of suprascapular nerve entrapment involves a thorough history and physical examination. Specific tests such as the suprascapular nerve stretch test and cross-body adduction test can help provoke pain and confirm the diagnosis. Electromyography (EMG) and nerve conduction studies are also useful investigative tools.
Treatment of suprascapular nerve entrapment syndrome often involves non-invasive measures, but in some cases, arthroscopic or open surgery may be required.
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The suprascapular artery and vein run alongside the nerve
The suprascapular nerve is a mixed nerve, providing both sensory and motor supply to the suprascapular region. It is derived from the ventral rami of cervical nerves C5 and C6, and occasionally C4. The nerve provides motor innervation to the supraspinatus and infraspinatus muscles, which are part of the muscle group called the rotator cuff muscles. It also provides sensory supply to the glenohumeral and acromioclavicular joints.
The suprascapular nerve is particularly susceptible to compressional and traction injuries at the suprascapular and spinoglenoid notches. Suprascapular nerve entrapment syndrome can cause shoulder pain and muscle weakness in the posterior shoulder region. This can be diagnosed through the suprascapular nerve stretch test, where the patient is asked to laterally rotate the head away from the affected shoulder and retract the neck. If the pain at the shoulder worsens, the test is positive.
The suprascapular artery and vein run alongside the suprascapular nerve to provide it with blood supply. The suprascapular artery can function as a branch of the thyrocervical trunk or as a direct branch of the subclavian artery. It runs inferolateral to the anterior scalene muscles, phrenic nerve, subclavian artery, and brachial plexus, crossing posterolateral and parallel to the clavicle. The suprascapular vein travels parallel to the artery.
The suprascapular nerve passes inferior to the superior transverse scapular ligament, while the suprascapular artery passes above it. The nerve then enters the supraspinous fossa, where it gives off two branches to the supraspinatus muscle. The artery courses laterally to the scapular spine and then enters the infraspinous fossa, where it provides two terminal branches to the infraspinatus muscle.
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Frequently asked questions
The suprascapular nerve is a branch of the superior trunk of the brachial plexus. It is a mixed nerve, meaning it provides both sensory and motor supply.
The suprascapular nerve provides motor supply to the supraspinatus and infraspinatus muscles. It also provides sensory supply to the glenohumeral and acromioclavicular joints.
Injury to the suprascapular nerve can cause pain and weakness in the shoulder. It can also lead to supraspinatus and infraspinatus muscle atrophy, affecting the range of motion in the arm and shoulder.
Suprascapular nerve entrapment occurs when the nerve becomes compressed or trapped within the suprascapular canal. This can lead to shoulder pain, muscle weakness, and atrophy of the supraspinatus and infraspinatus muscles.
