A second member is disposed within the first member to transmit force to move a cutting implement disposed at its distal end and cause it to cut {HEAD ~ tissue} that is exposed to {TAIL ~ the implement} through the opening 
is exposed to
A second member is disposed within the first member to transmit force to move a cutting implement disposed at its distal end and cause it to cut { HEAD ~ tissue } that is exposed to { TAIL ~ the implement } through the opening
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 OTH HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH