Subclavius

Subclavius is a small triangular muscle, located in the upper chest, beneath the clavicle. It plays a crucial role in the functioning of the shoulder.

Anatomy

The Subclavius muscle originates from the first rib and its cartilage, and it inserts into the lower surface of the clavicle. It is innervated by the nerve to subclavius, which arises from the upper trunk of the brachial plexus. The muscle is supplied by the thoracoacromial artery.

Function

The primary function of the Subclavius muscle is to stabilize the clavicle in its position. It depresses the lateral clavicle, pulling it downwards and forwards. This action is important in movements where the arm is raised above the head.

Clinical significance

The Subclavius muscle can be involved in several medical conditions. It can contribute to thoracic outlet syndrome, a condition that causes pain in the neck and shoulder, numbness and tingling of the fingers, and a weak grip. The subclavius muscle can also be involved in costoclavicular syndrome, a condition characterized by pain and loss of sensation in the arm and hand.

See also

• List of muscles of the human body
• Thoracic outlet syndrome
• Costoclavicular syndrome

References

Subclavius Resources
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