jaw mappings - skeleton or subdivision of head

[cmungall]

In MA, the class 'jaw' is for the most part implicitly a skeletal structure:

      is_a MA:0000576 ! head bone [xref: EMAPS:3599628]
       part of MA:0000316 ! cranium [xref: EMAPS:1768028]
        part of MA:0000318 ! viscerocranium [xref: EMAPS:1802228]
         part of MA:0001905 ! jaw ***  [xref: EMAPS:3290528]
          part of MA:0000348 ! tooth [xref: EMAPS:3290628]
          part of MA:0001906 ! lower jaw [xref: EMAPS:1790628]
          part of MA:0001908 ! upper jaw [xref: EMAPS:1792428]
          part of MA:0003119 ! alveolar process [xref: EMAPS:3511828]
          part of MA:0003130 ! jaw bone [xref: EMAPS:3545328]
          part of MA:0003220 ! jaw epithelium [xref: EMAPS:3290428]
```~

i.e. we don't find lips and gums here, as gums are not part of head bones - gums are part of the jaw sensu region, not jaw sensu skeleton.

EMAPA has the distinction between jaw as a head subdivision (inclusive of soft tissue) and jaw skeleton (which could arguably include teeth but that's a separate issue).

MA maps its "jaw" and "lower jaw" structures to the regions, but I believe given the structure of MA it would be more appropriate to map to the the skeletal structures.

For example, here is "lower jaw" in EMAPA (179606 corresponds to EMAPS:1790628, what is called "lower jaw" in MA)

po EMAPA:17906 ! lower jaw *** 
 po EMAPA:17907 ! Meckel's cartilage
 po EMAPA:17909 ! lower lip
 po EMAPA:17910 ! lower jaw skeleton
 po EMAPA:17916 ! lower jaw mesenchyme
 po EMAPA:17917 ! lower jaw tooth
 po EMAPA:18291 ! lower jaw alveolar sulcus
 po EMAPA:18967 ! lower jaw gum
 po EMAPA:25099 ! lower jaw alveolar canal
 po EMAPA:35516 ! lower jaw epithelium

Original comment by: cmungall

Original Ticket: [obo/mouse-anatomy-requests/88](https://sourceforge.net/p/obo/mouse-anatomy-requests/88)

[cmungall]

some textual definitions might help here...

Original comment by: cmungall