seger/aao — Issue #4: placodes
Author: cmungall
Created: 2011-11-28 01:45:49+00:00
State: open

cranial placode has only one child:

~~is_a AAO:0010466 ! cranial placode
~~~~is_a AAO:0010718 ! lateral line placodes

(note that this is mirrored in XAO, but with develops_from. AAO is correct, it should be is_a).

lens placode is under embryonic structure

~~is_a AAO:0010825 ! anatomical structure
~~~~is_a AAO:0000138 ! embryonic structure
~~~~~~is_a AAO:0011055 ! lens placode ***

placode terminology is confusing. My understanding is that lens placodes are considered non-neurogenic cranial placodes.

The next release of uberon will have the hierarchy

ectodermal placode (includes sweat glands etc)
~~ cranial placode (includes lens, adenohypophyseal)
~~~~ neurogenic placode (gives rise to neurons)

I suspect AAO and XAO are using the term "cranial placode" to mean "neurogenic placode" (reflecting the origin of these ontologies in ZFA)