The omoclavicular, or subclavian, triangle is the small lower part of the posterior triangle just above the clavicle. It is bounded by the inferior belly of omohyoid, the clavicle and sternocleidomastoid, and corresponds to the greater supraclavicular fossa.
| Location | Just above the middle of the clavicle. |
|---|---|
| Boundaries |
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| Contents |
Gives access to the subclavian artery and brachial plexus above the clavicle.
The third part of the subclavian artery and the trunks of the brachial plexus lie here, so it is the site of supraclavicular nerve blocks and where the subclavian pulse can be felt and compressed against the first rib. Supraclavicular lymph nodes in this area can signal cancer elsewhere.
An enlarged left supraclavicular lymph node in this region, often a sign of cancer in the abdomen.
The lung apex lies just below this triangle, so needles placed here can puncture the pleura.
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