Synovial chondromatosis

Subclavian triangle (also known as the omoclavicular triangle or Lesser supraclavicular fossa) is a small division of the anterior triangle of the neck. It is a region of the neck bounded by the sternocleidomastoid muscle, the clavicle, and the omohyoid muscle.

Anatomy

The subclavian triangle is located in the lower part of the neck. It is bounded:

• Above, by the inferior belly of the omohyoid muscle.
• Below, by the clavicle.
• Behind, by the sternocleidomastoid muscle.

The floor of the triangle is formed by the scalene muscles and the first rib with its covering of pleura. The subclavian artery and brachial plexus pass through the triangle, above the first rib.

Clinical significance

The subclavian triangle is of clinical importance as it is a site where the subclavian artery and brachial plexus can be compressed, leading to thoracic outlet syndrome. It is also a common site for the insertion of a central venous catheter.

See also

• Anterior triangle of the neck
• Posterior triangle of the neck
• Scalene muscles
• Thoracic outlet syndrome

References

Synovial chondromatosis Resources
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