of particular interest for this study was cell death occurring in the dorsal ( proximal ) aspects of the maxillary and mandibular prominences of the first visceral arch , the second visceral arch , and the first visceral cleft , areas that correspond to the locations of the first and second arch ectodermal ( `` '' ganglionic '' '' ) placodes and first closing membrane , respectively .
C1512982
mandibular prominences
C0231063
first visceral arch