In one application, {TAIL ~ the end effector} is insertable into {HEAD ~ the esophagus} of a patient 
In one application , { TAIL ~ the end effector } is insertable into { HEAD ~ the esophagus } of a patient
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH