Fig. 2.

Comparison of brain ventricular system in 6 dpf zebrafish (a) and stage 53 Xenopus (b). The zebrafish larval BVS contains two ventricles unlike that of larval Xenopus. Whereas the IIIrd ventricle and posterior SA by the end of embryogenesis acquire rather complex configuration these are not that different from corresponding part of BVS in Xenopus. Green—ventricular system, blue—choroid plexus, red—subcommissural organ, III—IIIrd ventricle, IV—IVth ventricle, L—lateral ventricle, SA—Sylvius aqueduct

(modified from Turner et al. [77], and Mogi et al. [58], correspondingly)