part of develops from ends during starts during peripheral nervous system dorsolateral placode region epibranchial placode The three distinct placodal areas which develop from the posterior placodal area and lie ventral to the otic placode and dorsocaudal to the pharyngeal clefts, and contribute to the sensory ganglia for the distal portion of cranial nerves VII IX and X. The proximal neurons are derived from the neural crest. UBERON:0003078 xenopus_anatomy XAO:0000284 sensorial layer neurogenic placode NF stage 28 NF stage 37 and 38