{HEAD ~ The front wheel} is a caster wheel pivotally attached to an arm directly or indirectly connected to {TAIL ~ the wheelchair frame} 
{ HEAD ~ The front wheel } is a caster wheel pivotally attached to an arm directly or indirectly connected to { TAIL ~ the wheelchair frame }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL