auditory pits

o·tic pits

paired depression, one on either side of the head of the embryo, marking the location of the future otic vesicles.
Synonym(s): auditory pits
Farlex Partner Medical Dictionary © Farlex 2012

au·di·to·ry pits

(aw'di-tōr-ē pits)
Paired depressions, one on either side of the head of the embryo, marking the location of the otic placodes, the future auditory vesicles.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012