has potential to developmentally contribute to has potential to developmentally contribute to dorsolateral placode trigeminal placode complex A neurogenic placode that arises at the level of the midbrain-hindbrain boundary and develops into a trigeminal ganglion. Consider naming this 'trigeminal placode complex'. Also, Fig9-5 of ISBN10:0471888893 calls this the profundus placode; XAO says 'profundal and the trigeminal ganglia are separate distally but fused at their proximal end...' EFO:0003433 EHDAA2:0004209 TAO:0000162 The dorsolateral placodes (trigeminal and vestibular) develop from ectoderm lateral to the brain (...). In summary, the collective term 'placodes' refers to some rather different structures, probably with different evolutionary origins. Some sensory placodes (at least the otic and olfactory) may have homologues in basal chordates. Even if this is so, it is apparent that they were elaborated considerably during early vertebrate evolution. Epibranchial and dorsolateral placodes appear to be new; we infer that their origin depended on the evolution of specific inductive signals.[well established][VHOG] The ectodermal precursor of the trigeminal ganglion. The profundal and the trigeminal ganglia are separate distally but fused at their proximal end as they condense around NF stage 24.[XAO] The ectodermal rudiment of the trigeminal ganglion, distinguishable during much of the segmentation period. Kimmel et al, 1995.[TAO] UBERON:0003070 VHOG:0000109 XAO:0000225 ZFA:0000162 profundus V placode profundus placode trigeminal V placode trigeminal placode trigeminal placodes uberon somatic sensory system