flexural organ
A portion of tissue that is the most anterior portion of the notochord. The flexural organ secretes Reissner's fiber-related proteins, including F-spondin. [ https://sourceforge.net/tracker/?group_id=76834&atid=994726 ]
Term info
flexural organ
we cannot classify as a secretory circumventricular organ, as this leads to unsatisfiability
uberon
UBERON:0011577
http://purl.obolibrary.org/obo/NCBITaxon_7711
may be an ontogenetical remnant of the infundibular organ in cephalochordates