The ridges in the cylinder engage the annular ridges on the plunger in {HEAD ~ a snap fit and prevent removal} of {TAIL ~ the plunger} from the cylinder after the syringe has been used 
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The ridges in the cylinder engage the annular ridges on the plunger in { HEAD ~ a snap fit and prevent removal } of { TAIL ~ the plunger } from the cylinder after the syringe has been used
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH