Auditory pit
Section through the head of a human embryo, about twelve days old, in the region of the hind-brain.
Gray's	subject #228 1029
Precursor	auditory plate

The first rudiment of the internal ear 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^[1]).

[edit] References

1. ^ hednk-010 — Embryology at UNC

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v • d • e Prenatal development/Mammalian development of eye and ear (GA 10.1002) Eye development Optic vesicles · Optic stalk · Optic cup · Lens placode Auditory development Auditory vesicle · Auditory pit eye navs: anat/adnexa anat/pathways/physio/dev, noncongen/congen/neoplasia, eponymous signs, proc ear navs: anat/pathways/physio/dev, noncongen/congen, eponymous signs, proc