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