Auditory pit
Encyclopedia
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 placode
In embryology, the otic placode is a thickening of the ectoderm on the outer surface of a developing embryo from which the ear develops. The ear, including both the vestibular system and the auditory system, develops from the otic placode beginning the third week of development...
, over the region of the hind-brain. The auditory plate becomes depressed and converted into the auditory pit (or otic pit).