Fig. 7From: A high-density microelectrode-tissue-microelectrode sandwich platform for application of retinal circuit studyOptical microscope picture of the MEA device. a Picture of the head of the MEA. b Enlarged picture of the head of the MEA. c The central region of the MEA, note the microelectrodes and diffusion holes. d The outer region of the MEA. e SEM photo of the microelectrode (×5000). The diameter is about 11.5 μmBack to article page