has developmental contribution from has developmental contribution from extends_fibers_into glossopharyngeal nerve glossopharyngeal ganglion EHDAA2:0000710 EHDAA:2838 EMAPA:16795 FMA:53471 MA:0001077 TAO:0001301 The group of neuron cell bodies associated with the ninth cranial nerve. These (the epibranchial placodes) are focal thickenings of the embryonic ectoderm that form immediately dorsal and caudal of the clefts between the pharyngeal arches in all vertebrates, and they produce the neuroblasts which migrate and condense to form the distal cranial ganglia: the geniculate, petrosal and nodose ganglia. (...) The one substantial difference between the vertebrate pharyngeal arches and those of the protochordates is the presence of the epibranchial placodes but the evolution of these structures was undoubtedly driven by the endoderm.[well established][VHOG] UBERON:0001701 VHOG:0000702 ZFA:0001301 gIX ganglion of glossopharyngeal nerve ganglion of glosspharyngeal nerve glossopharyngeal IX ganglion petrosal ganglion uberon cranial ganglion glossopharyngeal neural crest petrosal placode epibranchial ganglion structure with developmental contribution from neural crest