part of start stage end stage somite 20 sclerotome somite 20 TAO:0000956 Ventromedial region of somite 20 that will form vertebral cartilages and connective tissues. The sclerotome lies ventral to the myotome. Cells of the sclerotome will migrate dorsally to surround the notochord and neural tube. zebrafish_anatomy ZFA:0000956 sclerotome segmentation:20-25 somites hatching:pec-fin