Alternatively, the practitioner or assistant may grasp {HEAD ~ the coil} between a thumb and {TAIL ~ fingers} to feel for the palpable ridges as the coil is withdrawn from the endoscope or feel for vibration of the coil as the textured portion exits the endoscope 
between
Alternatively , the practitioner or assistant may grasp { HEAD ~ the coil } between a thumb and { TAIL ~ fingers } to feel for the palpable ridges as the coil is withdrawn from the endoscope or feel for vibration of the coil as the textured portion exits the endoscope
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL 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 OTH