Fig. 1
From: Early development of the cochlea of the common marmoset, a non-human primate model
Histological analysis of the developing cochlea in the common marmoset using hematoxylin–eosin staining. (A) A cross-sectional view of the common marmoset cochlear duct in an E70 embryo. Cochlear duct formation had already started at E70. However, the coiled structure appeared only as a hook-like structure. (B) A cross-sectional view of the common marmoset cochlea duct in an E77 embryo. At E77, the elongation and coiling of the cochlear duct were more prominent. At this stage, the apical and basal turns can be distinguished. On the modiolar side, spiral ganglion neuron formation was observed at this stage. (C) A cross-sectional view of the common marmoset cochlea duct in an E87 embryo. At E87, the overall coiled structures of the cochlear duct were well developed and approximately two turns of the coiled structure were observed. The scala vestibuli and the scala tympani were not formed. (D) A cross-sectional view of the common marmoset cochlea duct in an E92 embryo. At E92, the coiled structure of the cochlear duct was almost completely formed. At this stage, the immature scala vestibuli and scala tympani were observed in the basal turns