part of develops from start stage end stage midbrain torus longitudinalis longitudinal torus ZFA:0000449 zebrafish_anatomy TAO:0000449 Multi-tissue structure that is a paired longitudinal eminence of granular cells that develops from the alar plate and is attached to the tegmentum in the medial tectal ventricle. The torus longitudinalis only occurs in ray finned fishes. tori longitudinalis alar plate midbrain region multi-tissue structure unknown adult