The scalene triangle, or interscalene triangle, is the gap between anterior scalene in front, middle scalene behind and the first rib below. The brachial plexus roots and trunks and the subclavian artery pass through it, while the subclavian vein passes in front of anterior scalene, outside the triangle.
| Location | Root of the neck, above the first rib. |
|---|---|
| Boundaries |
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| Contents |
Provides passage for the brachial plexus and subclavian artery from the neck to the upper limb.
This is one of the three classic sites of compression in thoracic outlet syndrome, especially when the scalenes are enlarged or a cervical rib or fibrous band narrows the gap. The interscalene brachial plexus block is placed here for shoulder surgery.
Compression of the brachial plexus in the scalene triangle, causing arm pain, tingling in the ulnar fingers and weakness, worse with overhead activity.
An extra rib from C7 narrowing the triangle and compressing the lower plexus or subclavian artery.
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