part of start stage end stage midbrain brain nucleus ventro-caudal cluster TAO:0007003 ZFA:0007003 ventrocaudal cluster ventral caudal cluster vcc Early-forming neural cluster of the ventral midbrain. At 16 h, axons of the vcc grow caudally to pioneer the medial longitudinal fasciculus (MLF), which is part of the larger ventral longitudinal tract (VLT). Later, neurons from this cluster project axons rostrally into the tract of the post-optic commissure (TPOC). zebrafish_anatomy unknown segmentation:14-19 somites