abnormal adrenal medulla morphology abnormal adrenal chromaffin cell morphology MP:0008504 MPheno.ontology abnormal phaeochromocyte any structural anomaly of the neuroendocrine cells of the medulla of the adrenal gland that are innervated by the splanchnic nerve and that are responsible for epinephrine and norepinephrine secretion abnormal neuroendocrine cell morphology