abnormal artery development abnormal intersomitic artery morphology 2010-10-19T11:32:55Z MP:0010662 MPheno.ontology abnormal intersegmental artery morphology abnormal somitic artery morphology any structural anomaly of the small branching sprouts of the dorsal aorta that grow across the medial surface of the somite, turn right angles to grow over that surface and then fuse with other sprouts and form the vertebral arteries adjacent to the neural tube; the intersomitic arteries supply the body wall and persist in the adult as the posterior intercostal, subcostal and the lumbar arteries csmith abnormal intersomitic vessel morphology