On a diagram, the main sections of a syringe are the tip, barrel and plunger, according to the UNC Eshelman School of Pharmacy. The tip is the metal needle at the top, the barrel holds the contents and the plunger moves up and down for injecting or drawing fluids.
The needle shaft, which connects to the barrel through a hub, has a bevel or diagonally cut opening on the sharp end. The hollow space in the needle is the lumen, according to the UNC Eshelman School of Pharmacy. Calibration lines or scales on the barrel mark volume in cubic centimeters or milliliters, details Ternopil State Medical University. The plunger has a flat thumb rest and ends inside the barrel with a rubber stopper.