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The subclavius muscle is a small, triangular muscle in the anterior thorax, located between the clavicle and the first rib. Its main function is to stabilize the clavicle during movements of the shoulder girdle and arm. The subclavius is innervated by the subclavian nerve, also known as the nerve to subclavius. This nerve is a small motor nerve that arises from the upper trunk of the brachial plexus, typically from the C5 and C6 nerve roots.
| Characteristics | Values |
|---|---|
| Nerve Name | Subclavian nerve, nerve to subclavius |
| Origin | Brachial plexus, C5-C6 nerve roots |
| Type | Small motor nerve |
| Function | Innervates the subclavius muscle, assists in diaphragm innervation via the accessory phrenic nerve |
| Muscle Location | Beneath the clavicle |
| Muscle Function | Stabilizes the sternoclavicular joint, prevents injury to adjacent neurovascular structures during fractures |
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What You'll Learn
- The subclavian nerve (C5-6) is a small branch of the brachial plexus
- The nerve to the subclavius originates from the C5-C6 nerve roots
- The subclavius muscle is located beneath the clavicle
- The subclavius muscle helps stabilise the sternoclavicular joint
- Costoclavicular syndrome is a type of thoracic outlet syndrome
The subclavian nerve (C5-6) is a small branch of the brachial plexus
The subclavian nerve, also known as the nerve to the subclavius muscle, is a small motor nerve that arises from the brachial plexus. Specifically, it originates from the C5 and C6 nerve roots of the superior trunk of the brachial plexus. The subclavian nerve is responsible for innervating the subclavius muscle, which is located beneath the clavicle.
The subclavius muscle is a short, triangular muscle in the anterior thorax, situated between the clavicle and the first rib. It originates from the upper border of the first rib and its cartilage, and inserts on the undersurface of the middle third of the clavicle. The primary function of the subclavius muscle is to stabilize the clavicle during movements of the shoulder girdle and shoulder and arm movements, particularly at the sternoclavicular joint.
The subclavius muscle also plays a role in preventing injuries to the adjacent neurovascular structures, such as the brachial plexus and subclavian blood vessels, in the event of a fractured clavicle. This is important as the subclavian nerve's relatively short course makes it susceptible to injury during clavicular fractures or surgical procedures in the area.
Additionally, the subclavius muscle may contribute to the control of the position of the scapula in relation to the thorax through its lateral aponeurotic extension and fascial connections. This regulation of the scapula's position may influence the output of kinetic energy during upper extremity movements.
Overall, the subclavian nerve (C5-6) is a small but crucial branch of the brachial plexus, providing innervation to the subclavius muscle and contributing to the stabilization of the clavicle and surrounding structures.
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The nerve to the subclavius originates from the C5-C6 nerve roots
The subclavius muscle is a small, triangular muscle in the anterior thorax located between the clavicle and the first rib. It originates on the upper border of the first rib and its cartilage, inserting on the undersurface of the middle third of the clavicle in a bony groove. The subclavius is enclosed by the clavipectoral fascia, a fibrous connective tissue that spans the interval between the clavicle and pectoralis minor muscle.
The subclavian nerve's relatively short course makes it susceptible to injury during clavicular fractures or surgical procedures in the area. Its primary function is to innervate the subclavius muscle, but it also gives rise to the accessory phrenic nerve, which joins the phrenic nerve in the thorax and assists in the diaphragm's innervation. There is no direct connection between the subclavian nerve and the main phrenic nerve.
The subclavius muscle is innervated by the subclavian nerve (C5-6), a small branch arising from the superior trunk of the brachial plexus. The subclavius receives arterial blood from the clavicular branch of the thoracoacromial artery, with contributions from the suprascapular artery. The main function of the subclavius is the active stabilization of the clavicle at the sternoclavicular joint during movements of the shoulder and arm.
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The subclavius muscle is located beneath the clavicle
The subclavius muscle is a small, triangular muscle located in the anterior thorax, beneath the clavicle. It is enclosed by the clavipectoral fascia, a fibrous connective tissue that spans the interval between the clavicle and pectoralis minor muscle. The subclavius originates from the first rib and inserts on the undersurface of the middle third of the clavicle. Its main function is to actively stabilize the clavicle at the sternoclavicular joint during movements of the shoulder and arm. The contraction of the subclavius muscle leads to a depression of the sternal end of the clavicle and subsequent elevation of the first rib. This muscle also plays a role in preventing injuries to the adjacent neurovascular structures, such as the subclavian blood vessels and the brachial plexus, in the event of a fractured clavicle.
The subclavius muscle is innervated by the subclavian nerve, also known as the nerve to subclavius. This nerve arises from the upper trunk of the brachial plexus, specifically from the C5 and C6 nerve roots. The subclavian nerve has a relatively short course, which makes it susceptible to injury during clavicular fractures or surgical procedures in the area. In addition to innervating the subclavius muscle, the subclavian nerve also gives rise to the accessory phrenic nerve, which assists in the diaphragm's innervation.
The blood supply to the subclavius muscle comes from the clavicular branch of the thoracoacromial artery, with additional contributions from the suprascapular artery. This muscle is also associated with costoclavicular syndrome, which is one of the types of thoracic outlet syndromes (TOS). Costoclavicular syndrome occurs when the vessels and nerves behind the subclavius muscle become entrapped between the clavicle and the first rib, leading to irritations of the brachial plexus and circulatory disorders of the arm.
The subclavius muscle is involved in the control of the position of the scapula in relation to the thorax through its lateral aponeurotic extension and fascial connections. While the contraction of this muscle was previously thought to stabilize the clavicle by shortening the distance between the sternoclavicular and acromioclavicular joints, newer studies suggest that it may instead regulate the output of kinetic energy during the movement of the upper extremity. The specific innervation of the subclavius muscle by a branch of the brachial plexus supports the idea that it provides important information about the upper extremity.
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The subclavius muscle helps stabilise the sternoclavicular joint
The subclavius muscle is a small, triangular muscle in the anterior thorax located between the clavicle and the first rib. It originates on the upper border of the first rib and its cartilage, and inserts on the inferior surface of the middle third of the clavicle in a bony groove. The subclavius is enclosed by the clavipectoral fascia, a fibrous connective tissue that spans the interval between the clavicle and pectoralis minor muscle.
The subclavius muscle is innervated by the subclavian nerve, also known as the nerve to subclavius. This nerve is a small branch that arises from the superior trunk of the brachial plexus, specifically from the C5 and C6 nerve roots. The subclavian nerve's relatively short course makes it susceptible to injury during clavicular fractures or surgical procedures in the region.
The main function of the subclavius muscle is to stabilise the clavicle and actively stabilise the sternoclavicular joint during movements of the shoulder and arm. Its contraction leads to a depression of the sternal end of the clavicle and a subsequent elevation of the first rib. This muscle is also important in preventing injuries to the adjacent neurovascular structures, such as the subclavian blood vessels and the brachial plexus, in the event of a fractured clavicle.
Additionally, the subclavius muscle contributes to the control of the position of the scapula in relation to the thorax. While the contraction of the subclavius does not shorten the distance between the sternoclavicular and acromioclavicular joints, it is hypothesised to increase tension at the tendinous border and the aponeurosis. This suggests that the subclavius regulates the output of kinetic energy during the movement of the upper extremity rather than solely acting as a stabilisation muscle.
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Costoclavicular syndrome is a type of thoracic outlet syndrome
The subclavius muscle is a short, triangular muscle of the thoracic wall that lies underneath the clavicle. Its main function is to stabilize the clavicle during movements of the shoulder and arm. The subclavius is innervated by the subclavian nerve, a small branch that arises from the superior trunk of the brachial plexus.
The symptoms of TOS can include pain, weakness, paraesthesia, and loss of muscle at the base of the thumb in the neurogenic type, swelling, pain, and bluish coloration of the arm in the venous type, and pain, coldness, and pallor of the arm in the arterial type. It is a difficult condition to diagnose, and the symptoms can vary widely, affecting the shoulders, neck, arms, and hands. Treatment options for TOS include NSAIDs for pain management, surgery, lifestyle modifications, physical therapy, and rehabilitation.
Several notable individuals, including musicians and athletes, have been diagnosed with or treated for thoracic outlet syndrome. The condition affects about 1% of the population and is more common in women, typically occurring between the ages of 20 and 50.
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Frequently asked questions
The subclavius muscle is a short, triangular muscle in the anterior thorax located between the clavicle and the first rib.
The main function of the subclavius muscle is the active stabilization of the clavicle at the sternoclavicular joint during movements of the shoulder and arm.
The subclavian nerve, also known as the nerve to subclavius, is a small motor nerve that innervates the subclavius muscle.
The subclavian nerve arises from the upper trunk of the brachial plexus, typically from the C5 and C6 nerve roots.
