<prompt> All are derivatives of ectoderm except-epidermisparotid glandneuro hypophysisarrector pilorum  <response>: Surface ectoderm derivatives:- Epithelium and glands skin epithelium sweat glands, sebaceous glands Myoepitheliocytes of skin glands Any external opening oral opening Rathkes pouch Most of the Pituitary gland salivary glands parotid, submandibular, sublingual glands Neural plate ectoderm derivatives Iris muscles- sphincter and dilator pupillae CNS neurohypophysis NeurohypophysisPosterior pituitary gland 