Dominic Stone
The supraspinatus muscle is located in the upper shoulder region. It is a small but important muscle that is part of the rotator cuff muscle group. The supraspinatus muscle originates from the supraspinous fossa of the scapula and inserts into the upper facet of the greater tuberosity of the humerus. It is responsible for abduction of the arm and works in cooperation with the deltoid muscle to perform this function. The supraspinatus muscle is also involved in stabilizing the shoulder joint and preventing the head of the humerus from slipping inferiorly. Calcification of the supraspinatus tendon is a common cause of shoulder pain and can be treated with arthroscopic surgery.
| Characteristics | Values |
|---|---|
| Location | Upper shoulder region |
| Muscle group | Rotator cuff |
| Position | Most superiorly located of the rotator cuff muscles |
| Origin | Supraspinous fossa of the scapula |
| Insertion | Upper facet of the greater tuberosity of the humerus |
| Innervation | Suprascapular nerve |
| Blood supply | Suprascapular and dorsal scapular arteries |
| Function | Abduction of the arm, stabilization of the shoulder |
| Pathologies | Rotator cuff tears, impingement syndromes, tendinitis, calcification |
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What You'll Learn
The supraspinatus is an intrinsic muscle of the shoulder region
The supraspinatus muscle is innervated by the suprascapular nerve, which originates from the nerve roots of C5 and C6. The muscle receives its blood supply mainly from the suprascapular and dorsal scapular arteries, which are branches of the thyrocervical trunk and the third part of the subclavian artery, respectively. These arteries provide the muscle with essential nutrients and oxygen for optimal functioning.
The supraspinatus muscle has several important functions. Firstly, it performs abduction of the arm, lifting and pulling the head of the humerus medially towards the glenoid cavity. It works in cooperation with the deltoid muscle to perform abduction, with the deltoid muscle becoming the main propagator of this action beyond 15 degrees. Additionally, the supraspinatus aids in stabilising the shoulder by resisting the inferior gravitational forces placed on the shoulder joint due to the downward pull of the upper limb.
The supraspinatus is the most frequently torn rotator cuff muscle and is susceptible to trauma and wear and tear from overuse and misuse. Common pathologies related to the supraspinatus muscle include rotator cuff tears, impingement syndromes, and tendinitis, often presenting as shoulder pain and restricted range of motion. Treatment options for these conditions may include strengthening exercises, physical therapy, and surgical interventions.
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It is one of four rotator cuff muscles
The supraspinatus muscle is one of four muscles that make up the rotator cuff, a group of muscles and tendons that surround the shoulder joint. The rotator cuff muscles help to move and rotate the arm and shoulder, allowing for an extensive range of motion, while also stabilising the glenohumeral joint and controlling humeral head translation.
The supraspinatus muscle itself performs abduction of the arm, pulling the head of the humerus medially towards the glenoid cavity. It is the most superiorly positioned rotator cuff muscle, occupying the supraspinous fossa of the scapula, above the spine of the scapula. The supraspinatus tendon extends laterally, passing beneath the acromion process and over the head of the humerus to insert onto the superior facet of the greater tuberosity of the humerus.
The other three rotator cuff muscles are the infraspinatus, teres minor, and subscapularis. The supraspinatus is the most frequently damaged component of the rotator cuff, with acute injury, gradual degeneration, and tears being common. Calcification of the supraspinatus tendon is a major contributor to shoulder pain and can be worsened by a supraspinatus tear.
The rotator cuff muscles receive their blood supply mainly from the suprascapular artery, the subscapular artery, and the posterior circumflex humeral artery. The supraspinatus muscle is innervated by the suprascapular nerve, which originates from the nerve roots of C5 and C6.
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The supraspinatus is the most frequently torn rotator cuff muscle
The supraspinatus muscle is located in the upper shoulder region. It is one of the four muscles that make up the rotator cuff, along with the infraspinatus, teres minor, and subscapularis muscles. The rotator cuff is a group of muscles and tendons that surround the shoulder joint, attaching the humerus (upper arm bone) to the shoulder blade and enabling a wide range of motion while maintaining the joint's stability.
Calcification of the supraspinatus tendon is a significant contributor to shoulder pain and is often exacerbated by a tear in the muscle. Treatment options for supraspinatus tears and associated conditions include strengthening exercises, physical therapy, and surgical interventions. Early treatment is essential to prevent symptoms from worsening and to restore normal function.
The supraspinatus muscle receives its blood supply primarily from the suprascapular and dorsal scapular arteries, which are branches of the thyrocervical trunk and the third part of the subclavian artery, respectively. These arteries provide essential nutrients and oxygen for the muscle's optimal functioning. The suprascapular nerve, which originates from the nerve roots of C5 and C6, innervates the supraspinatus.
In summary, the supraspinatus muscle is a critical component of the rotator cuff, enabling shoulder stability and motion. However, it is also the most susceptible to tears due to various factors such as age, posture, and repetitive stress. Early diagnosis and treatment are crucial for effective recovery and pain management.
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It is innervated by the suprascapular nerve
The supraspinatus muscle is a relatively small muscle located in the upper shoulder region. It is one of the four rotator cuff muscles, along with the infraspinatus, teres minor, and subscapularis muscles. The supraspinatus muscle originates from the supraspinous fossa of the scapula and attaches to the greater tubercle of the humerus.
The supraspinatus muscle receives its innervation from the suprascapular nerve. This nerve is a branch of the superior trunk of the brachial plexus, specifically arising from the upper trunk of the brachial plexus. It receives nerve fibres from the nerve roots C5 and C6 (and sometimes C4). The suprascapular nerve is a mixed nerve, containing both sensory and motor components. It provides sensory innervation to the acromioclavicular and glenohumeral joints, as well as motor innervation to the supraspinatus and infraspinatus muscles.
The suprascapular nerve originates in the posterior triangle of the neck and runs laterally and downward, parallel to the belly of the omohyoid muscle. It passes through the suprascapular notch and enters the supraspinous fossa, where it gives off branches to the supraspinatus muscle. The nerve then continues through the greater scapular (spinoglenoid) notch and terminates within the infraspinatus muscle, providing innervation to it as well.
The suprascapular nerve plays an important role in the function of the supraspinatus muscle. The supraspinatus muscle is responsible for abduction of the arm and works in cooperation with the deltoid muscle. It helps initiate abduction and assists the deltoid muscle beyond 15 degrees of abduction. The supraspinatus muscle also helps prevent the head of the humerus from slipping inferiorly and contributes to shoulder stability and motion.
Injuries or conditions affecting the suprascapular nerve can impact the function of the supraspinatus muscle. Suprascapular nerve entrapment syndrome can cause shoulder pain, muscle weakness, and restricted range of motion in the shoulder. Additionally, fractures of the overlying clavicle can damage the suprascapular nerve, reducing the person's ability to initiate abduction of the arm.
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Calcification of the supraspinatus tendon is a major contributor to shoulder pain
The supraspinatus is a small muscle located in the upper shoulder region. It is one of the four rotator cuff muscles, which also include the infraspinatus, teres minor, and subscapularis. The supraspinatus muscle contributes significantly to shoulder stability and motion.
Calcific tendinopathy (CT) of the shoulder is a common, painful condition caused by the presence of calcium deposits in the rotator cuff tendons. It usually results in shoulder pain and decreased range of motion. CT typically occurs in the supraspinatus tendon, which is the most common site of occurrence. The calcium deposits can vary in size from a few millimetres to a few centimetres, and they can cause chemical irritation and increased pressure in the tendon, leading to severe pain.
The presence of calcium deposits in the supraspinatus tendon can be identified through diagnostic imaging techniques such as X-rays and ultrasound scans. Treatment options for CT aim to reduce pain and inflammation, restore normal movement, and improve quality of life. Initial treatment approaches include rest, physiotherapy, and non-steroidal anti-inflammatory drugs (NSAIDs). If conservative treatments are ineffective, more invasive procedures such as ultrasound-guided injections, arthroscopic surgery, and extracorporeal shock wave therapy (ESWT) may be considered.
The supraspinatus tendon is particularly susceptible to calcification, which can result in significant shoulder pain. This pain can be exacerbated by a supraspinatus tear, further complicating the condition. Surgical interventions, such as arthroscopic procedures, have proven effective in treating both calcification and tendon tears, leading to a significant decrease in pain and improved shoulder functionality.
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Frequently asked questions
The supraspinatus muscle is located in the upper shoulder region.
The supraspinatus muscle performs abduction of the arm, pulling the head of the humerus medially towards the glenoid cavity. It also works with the deltoid muscle to perform abduction.
The supraspinatus is the most superiorly located of the four rotator cuff muscles. It is also the most frequently torn and the most important muscle of the rotator cuff.
Common pathologies related to the supraspinatus muscle include rotator cuff tears, impingement syndromes, and tendinitis, which often present as shoulder pain and restricted range of motion.
