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