<prompt> Chromaffin cells are derived from:Neural crestSurface ectodermNeuroectodermEndoderm  <response>: Ans. A Neural crestRef: Netters Atlas of Neurosciences, 3rd ed. pg. 133Derivatives of neural crest mnemonic: N.O.P.E Melanocytes Schwan cells Adrenal medulla Chromaffin cells Odontoblasts Parasympathetic ganglia of gut Parafollicular cells of thyroid Pia and arachnoid matters Endocardial cushions and aortopulmonary septum in heartDerivatives of neuroectoderm: All CNS neurons astrocytes, oligodendrocytes, ependymocytes, neurohypophysis and pineal gland. 