In one enablement, {TAIL ~ electrical leads}, not shown, are attached to the electrodes 24 and 26 and extend in {HEAD ~ the wall} of the sheath 12 
In one enablement , { TAIL ~ electrical leads } , not shown , are attached to the electrodes 24 and 26 and extend in { HEAD ~ the wall } of the sheath 12
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH