The discs may include perimeters having ovular or elliptical shapes that cooperate with {TAIL ~ a cylindrical interior wall} of {HEAD ~ the housing} to cut tissue specimens 
The discs may include perimeters having ovular or elliptical shapes that cooperate with { TAIL ~ a cylindrical interior wall } of { HEAD ~ the housing } to cut tissue specimens
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH