The interscalene traingle is the most medial of the three confined spaces that make up the thoracic outlet. It is bordered anteriorly by the anterior scalene muscle (AS) and posteriorly by the middle (MS) and posterior scalene muscles. The first rib (1) is makes up the floor.
The superior (C5-C6) and middle (C7) trunks of the brachial plexus pass through the upper part of the interscalene triangle and the lower (C8-T1) trunk travels through the lower part of the triangle behind the subclavian artery (SA). The subclavian vein (SV) is anterior to the triangle behind the clavicle (C).
References
- Demondion X, Boutry N, Drizenko A, Paul C, Francke JP, Cotten A. Thoracic outlet: anatomic correlation with MR imaging. AJR Am J Roentgenol. 2000 Aug;175(2):417-22.
- Demondion X, Herbinet P, Van Sint Jan S, Boutry N, Chantelot C, Cotten A. Imaging assessment of thoracic outlet syndrome. Radiographics. 2006 Nov-Dec;26(6):1735-50.
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