Embryonic duct that is the rudiment of cerebral ganglion and and neural gland of adult in the ascidians. [ http://dx.doi.org/10.1002/jez.b.21013 ]
Term information
Homology: candidate homolog for both neural crest and for the combined olfactory and adenohypophyseal placodes (Burighel et al., 2003; Manni et al., 2004a). Development: During formation of the adult ascidian, the ectodermal neurohypophyseal duct fuses with an evagination of the pharynx to form the neural gland rudiment