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In the longitudinal view it is possible t visualize the axillary vein as it travels underneath the clavicle an becomes the subclavian vein. This view allows safe guidance of a needle using the longitudinal approach directly into the vessel. Also, this allows visualization of the soft tissue deep tot the vein so that the operator knows the depth of the lung (would be visible as lung sliding of the pleura deep to the 2nd rib space.