otic pit otic pit the auditory pit, also known as the otic pit, is the first rudiment of the internal ear. it appears shortly after that of the eye, in the form of a patch of thickened ectoderm, the auditory plate, over the region of the hind-brain. the auditory plate becomes depressed and converted into the auditory pit (or otic pit). otic pitsection through the head of a human embryo, at the beginning of the fourth week, in the region of the hind-brain.detailsprecursorauditory plateidentifierslatinfovea oticatepit_by_e5.15.2.0.0.0.5 e5.15.2.0.0.0.5 anatomical terminology