The distal end of the optic fiber and {HEAD ~ the distal end} of the illuminator cannula are both provided with flat, {TAIL ~ beveled surfaces} 
The distal end of the optic fiber and { HEAD ~ the distal end } of the illuminator cannula are both provided with flat , { TAIL ~ beveled surfaces }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL OTH REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL