|Section through the head of a human embryo, about twelve days old, in the region of the hind-brain.|
|Gray's||subject #228 1029|
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).
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