Assertion: axillary vein | /r/LocatedNear | numerous fixed structures
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text: We speculate that, since the axillary vein is surrounded by numerous fixed structures (i.e., rib cage, pectoralis muscles, cutaneous fat tissue, and clavicle), its size might be influenced by both the surrounding structures and filling pressures rather than by the internal jugular vein which is more superficial and not otherwise contained by the rib cage.