part of start stage end stage magnocellular superficial pretectal nucleus magnocellular superficial pretectal nuclei ZFA:0000235 TAO:0000235 Diencephalic nucleus that is part of the superficial pretectum and is caudally contiguous with the caudal pretectal nucleus. Cells of the magnocellular superficial pretectal nucleus are slightly larger and more orderly around a central neuropil than those of the caudal pretectal nucleus. From Neuroanatomy of the Zebrafish Brain. zebrafish_anatomy superficial pretectum diencephalic nucleus unknown adult