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