The grooves engage corresponding annular ridges formed adjacent the top of the plunger when the plunger is inserted in the syringe cylinder, preventing {HEAD ~ withdrawal} of {TAIL ~ the plunger} from the cylinder 
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The grooves engage corresponding annular ridges formed adjacent the top of the plunger when the plunger is inserted in the syringe cylinder , preventing { HEAD ~ withdrawal } of { TAIL ~ the plunger } from the cylinder
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH