The regions between the pharyngeal arches are termed pharyngeal clefts. The indentation just dorsal to the second pharyngeal cleft is the developing inner ear, the otic pit. (See ear development unit for more information)

                     Species: Mouse 
                     Day Gestation: 9 
             Approx. Human Age: 27 days 
                                   View: Lateral 
                Pharyngeal Arches
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