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Anatomical identification of the internal jugular vein. (A) The vessel in short axis view in a newborn at term. Notice the diameters. IJV: internal jugular vein; ICA: internal carotic artery. (B) Notice how the vein collapses under a slight pressure, as oppose to the artery. (C) Doppler demonstrating the pulsatile flow in the artery. (D) Doppler demonstrating the laminar flow in the vein. Notice how the flow changes with the respiration.
