{TAIL ~ The anatomical apparatus} includes a support defining a cavity having {HEAD ~ a lower tier} of a selected width and an open upper wider tier communicating with the lower tier 
{ TAIL ~ The anatomical apparatus } includes a support defining a cavity having { HEAD ~ a lower tier } of a selected width and an open upper wider tier communicating with the lower tier
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH